MK3.9S

<p><strong>MK4 to MK4S upgrade <br /></strong></p>
<p>The current lead time is <strong>1-2 weeks </strong>for both xLCD versions. </p>
<p> </p>
<h3>Original Prusa CORE One shipping table</h3>
<table class="table" style="border-collapse: collapse; height: 963.875px; border-style: ridge; width: 100%;" border="1">
<tbody>
<tr style="height: 60.875px;">
<td style="height: 60.875px; width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center;">
<h4>  Order date</h4>
</td>
<td style="height: 60.875px; width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center;">
<h4>Estimated shipping</h4>
</td>
</tr>
<tr style="height: 33px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 33px;">
<p>  19.11.2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 33px;">
<p>from 31.1.2025</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>  20.11.2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>from week 7 (starts February 10, 2025)</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>  21.11.2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>from week 7 (starts February 10, 2025)</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>  22.11.2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>from week 8 (starts February 17, 2025)</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>  23.11.2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>from week 8 (starts February 17, 2025)</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>  24.11.2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>from week 8 (starts February 17, 2025)</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>W48 2024 - from November 25, 2024 </p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>from week 9 (starts February 24, 2025)</p>
</td>
</tr>
<tr style="height: 72px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>W49 2024 - from December 2, 2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>from week 10 (starts March 3, 2025) </p>
</td>
</tr>
<tr style="height: 72px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>W50 2024 - from December 9, 2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>from week 11 (starts March 10, 2025)</p>
</td>
</tr>
<tr style="height: 72px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>W51 2024 - from December 16, 2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>from week 11 (starts March 10, 2025)</p>
</td>
</tr>
<tr style="height: 72px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>W52 2024 -  from December 23, 2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>from week 12 (starts March 17, 2025)</p>
</td>
</tr>
<tr style="height: 72px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>W1 2025 - from December 30, 2024</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>from week 12 (starts March 17, 2025)</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>W2 2025 - from January 6, 2025</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>from week 13 (starts March 24, 2025)</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>W3 2025 - from January 13, 2025</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>from week 13 (starts March 24, 2025)</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>W4 2025 - from January 20, 2025</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>from week 13 (starts March 24, 2025)</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>W5 2025 - from January 27, 2025</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>from week 14 (starts March 31, 2025)</p>
</td>
</tr>
</tbody>
</table>
<h3><span style="font-size: 20px;">Current lead time estimates for new orders</span></h3>
<p><span style="color: #e67e23;"><strong>Updated: January 28th, 2025 </strong></span></p>
<p><em>The dates are only an estimation at the date of update, specified above, and rely on the actual</em> production. <em>We're doing our best but please be aware that it can shift for the lead time products. We will update here and on the product pages accordingly.</em></p>
<p>The lead time estimate applies to standalone products, other products in the order may increase the lead time.</p>
<p>If you've ordered a product in a bundle, the lead time of the order is set based on the product in the bundle with the longest lead time.</p>
<p></p>
<table class="table" style="border-collapse: collapse; height: 930.875px; border-style: ridge; width: 100%;" border="1">
<tbody>
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<td style="height: 60.875px; width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center;">
<h4>Product</h4>
</td>
<td style="height: 60.875px; width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center;">
<h4>Lead time</h4>
</td>
</tr>
<tr style="height: 72px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p><strong>MK4 to MK4S upgrade</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>1-2 weeks</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>MK3.9 to MK3.9S upgrade</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>1-2 weeks</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>MK3S/+ to MK4S upgrade</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>3-4 weeks</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>MK3S/+ to MK3.9S upgrade</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>1-2 weeks</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>MK3S/S+ to MK3.5S</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>1-2 weeks</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>Original Prusa MK4S</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>1 week</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>Original Prusa MK4S kit</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>1-2 weeks</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>Original Prusa XL<br /></strong>(Prusa XL Assembled 5-toolhead 3D Printer)</p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>1-2 weeks<br /><strong>(2-3 weeks)</strong></p>
</td>
</tr>
<tr style="height: 72px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p><strong>Original Prusa MMU3 upgrade kit<br />(for MK3.9/S &amp; MK4/S)<br /></strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>1-2 weeks</p>
</td>
</tr>
<tr style="height: 72px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p><strong>Original Prusa MMU2S to MMU3 upgrade<br />(for MK3.9/S &amp; MK4/S)</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>1-2 weeks</p>
</td>
</tr>
<tr style="height: 72px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p><strong>Original Prusa MMU3 assembled unit<br />(MK3.9/S &amp; MK4/S)</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>1-2 weeks</p>
</td>
</tr>
<tr style="height: 72px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p><strong>Original Prusa MMU3 assembled unit<br />(MK3S+ &amp; MK3.5/S)</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 72px;">
<p>1-2 week</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>Original Prusa XL Enclosure</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>1-2 weeks</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>Original Prusa MINI Enclosure</strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>1-2 weeks</p>
</td>
</tr>
<tr style="height: 51px;">
<td style="width: 48.3436%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p><strong>Original Prusa MK Enclosure </strong></p>
</td>
<td style="width: 51.6564%; border-style: dotted; border-width: 1px; text-align: center; height: 51px;">
<p>1-2 weeks</p>
</td>
</tr>
</tbody>
</table>
<p>You can find your order shipping date in the order detail section in our shop.</p>
<div class="note-callout">All products purchased in our <a href="https://shop.prusa3d.com/">online store</a> are currently being shipped from the<strong> Czech Republic, </strong>a member state of the <strong>European Union, customs charges may apply for shipments to countries outside of the EU!</strong> Please see our advisory article <a href="http://help.prusa3d.com/article/vat-value-added-tax-customs-fees_1505#orders-outside-eu">here</a>.</div>

Shipping information

Infill patterns

<div class="warning-callout">This is an&nbsp;<strong>advanced calibration</strong>, recommended only to&nbsp;<strong>experienced users</strong>.</div>
<p>The Extrusion Multiplier allows the fine-tuning of the extrusion flow rate - simply described as&nbsp;<strong>how much filament comes out of the nozzle</strong>. In other words, the&nbsp;<strong>Extrusion Multiplier</strong>&nbsp;setting in PrusaSlicer and the&nbsp;<strong>Flow rate</strong>&nbsp;setting in printer firmware are two ways to adjust the same thing, however, adjusting one of those two settings will not influence the value of the other.</p>
<p><strong>This procedure is not necessary with a new printer coming from the factory</strong>, but rather applies for specific applications and filaments. The ideal value is different for every type of material and every color. It can even differ from spool to spool. Bear this in mind if you change type and brand of filament often or use cheap no-name brands.</p>
<div class="note-callout">Total flow rate = <strong>Flow multiplier</strong> in firmware (M221) x <strong>Extrusion multiplier</strong> in PrusaSlicer. For those interested in diving deeper, PrusaSlicer uses the same <a href="https://manual.slic3r.org/advanced/flow-math">Flow math as Slic3r</a>.</div>
<h3><strong>How to spot an issue</strong></h3>
<p>This calibration is used to fix two common problems:</p>
<ul>
<li><strong>Overextrusion</strong> - Too much material is extruded (flow is too high). It causes scarring of bottom layers and unnecessary material buildup on top layers.</li>
<li><strong>Minor under extrusion</strong>&nbsp;- Not enough material is extruded (flow is too low). It causes small gaps that appear between layer lines or perimeters.</li>
</ul>
<p><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over-600x282.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over-800x376.jpg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over-300x141.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over-768x361.jpg 768w, https://cdn.help.prusa3d.com/wp-content/uploads/under-ok-over-1536x721.jpg 1536w" alt="" width="852" height="400"></p>
<p><strong>Overextrusion</strong> is a common problem with many filament brands. It's especially problematic when you're trying to glue two parts of the model. <strong>If the top layer is over extruded, you'll end up with an uneven surface that will prevent a seamless connection between the two pieces.</strong></p>
<h3><strong>How to do the calibration</strong></h3>
<p>In PrusaSlicer, navigate to <span class="key">Filament Settings</span> and look for Extrusion Multiplier. The default setting (for PLA) is 1, this value represents a percentage, 1 = 100%, 0.95 = 95% etc. Usually, the adjusted values can be between 0.9 and 1.1. To adjust it, simply rewrite the value.</p>
<p><img decoding="async" style="max-height: 200px; display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusuki/prusuki-images/image-2019-1-15-12-55-6.png" data-hd-height="200px"></p>
<p>In the printer menu, during a print, go to the Tune menu and then choose Flow. Again, the usual values can range between 90 and 110, although that does not mean you can't go above or below that.</p>
<h4>Which method should I use?</h4>
<p>There are two methods you can use to calibrate the Extrusion Multiplier, and we'll cover both of them in this article:</p>
<ul>
<li><strong>Precise Method</strong>&nbsp; -&nbsp; using precision tools such as calipers or micrometers.</li>
<li><strong>Visual Method&nbsp;</strong>&nbsp;- an easy method based on observing the visual properties of your models.</li>
</ul>
<p>The choice of the method depends entirely on your preferences; in the end, both yield similar results. Even the visual method will enable you to have perfectly fitting parts with smooth &amp; flat top layers.</p>
<h4>Precise Method</h4>
<div class="note-callout">Please note that the following guide is based on <strong>default</strong> PrusaSlicer 0.4 nozzle profiles, with a layer height of 0.1mm - 0.2mm. This means that:<br />
- Nozzle size = 0.4<br />
- Extrusion width =&nbsp;0.45<br />
- Basic materials (PLA, ABS, PETG) Extrusion Multiplier = 1<br />
<strong>If you wish to calibrate the printer with a bigger/smaller nozzle or layer heights above 0.2, then you will need to adjust these values as well.</strong></div>
<ol>
<li>Download the <a href="https://cdn.help.prusa3d.com/wp-content/uploads/2021/04/cube-40-40-40.zip">Precision Method Cube STL</a>.</li>
<li>Slice it using the Vase Mode and your most-often used layer height and print it. You can find Vase mode (Print Settings →&nbsp; Layers and perimeters →&nbsp; Spiral vase).</li>
<li>Make three or more measurements in the middle of each wall and calculate the overall average thickness.</li>
<li>Calculate the extrusion multiplier using the following formula: <strong>Extrusion multiplier = (Extrusion width (0.45) / Average measured wall thickness)</strong>.</li>
<li>Adjust the Extrusion Multiplier in Filament Settings → Filament</li>
<li>Re-print the cube with new settings and go back to step 3 if necessary.</li>
</ol>
<p><img decoding="async" style="max-height: 220px; display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusuki/prusuki-images/micrometer-small-jpg.JPG" height="400" data-hd-height="220px"></p>
<div class="warning-callout">Please note that cheap digital calipers may not be accurate enough to make reliable measurements of a single perimeter wall.</div>
<h4>Visual Method</h4>
<p>This method does not require any tools, only your sight. The point is to make sure your top layers are <strong>smooth</strong>, <strong>shiny,</strong> and without <strong>scarring or filament buildup</strong> near the perimeters.</p>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/destiky6.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/destiky6-600x374.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/destiky6-800x499.jpg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/destiky6-300x187.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/destiky6-768x479.jpg 768w, https://cdn.help.prusa3d.com/wp-content/uploads/destiky6-1536x958.jpg 1536w" alt="" width="641" height="400"></p>
<ol>
<li>Download the <a href="https://cdn.help.prusa3d.com/wp-content/uploads/2021/04/visual-method-cube.zip">Visual Method Cube.stl</a></li>
<li>Slice it using the default Prusa PLA presets at 0.20mm layer height and print it.</li>
<li>Inspect the top layer of your cube visually and with the tip of the finger.</li>
<li>If the top is under extruded or not smooth, then re-adjust the Extrusion Multiplier accordingly by 1-2%.</li>
<li>Repeat the steps above as long as needed.</li>
</ol>
<p>If there is&nbsp;<strong>too much material</strong>&nbsp;near the perimeters,&nbsp;<strong>decrease</strong>&nbsp;the Extrusion Multiplier value.</p>
<p><img decoding="async" style="max-height: 390px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusuki/prusuki-images/buildu.jpg" data-hd-height="390px" data-hd-align="left"></p>
<p>If there are&nbsp;<strong>visible gaps</strong>&nbsp;between layer lines,&nbsp;<strong>increase</strong> the Extrusion Multiplier value. (Microscopic gaps near the perimeters are OK.)</p>
<p><img decoding="async" style="max-height: 430px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusuki/prusuki-images/gaps.jpg" data-hd-height="430px" data-hd-align="left"></p>


Extrusion multiplier calibration

<p>Stringing or oozing, also known as "hairy prints", is the name given for when small strings of filament are left on a printed model. This usually happens when the filament keeps flowing from the nozzle while the extruder is moving to another object. You can see this as a marginal line of filament left between the objects.</p>
<p>This issue is caused by <strong>very high printing temperatures and/or using incorrect retraction settings</strong>. This can be solved by changing a couple of settings in PrusaSlicer and checking your hardware.</p>
<table style="border-collapse: collapse; width: 100%;" border="0">
<tbody>
<tr>
<td style="width: 48.8442%;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-600x383.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-800x511.jpg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-300x192.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-768x490.jpg 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-1536x981.jpg 1536w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b-2048x1308.jpg 2048w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/90014ff5fc80d10b.jpg 1600w" alt="" width="400" height="255"></td>
<td style="width: 48.8442%;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00-600x400.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00-800x534.jpg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00-300x200.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00-768x512.jpg 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/b1b72c32290b8c00.jpg 1600w" alt="" width="400" height="267"></td>
</tr>
</tbody>
</table>
<h3>Stringing from material left on the nozzle</h3>
<p>If you print for a long time from a single type of filament, such as PET-G, the filament can create a thin layer in the nozzle. This can cause stringing as the strands of the filament stick to the surface of the print. Therefore, thoroughly clean the nozzle before printing and make sure that any dirt or remnants of previous filaments are removed from the nozzle.</p>
<div class="warning-callout">We highly recommend using our official (factory default) preset settings in PrusaSlicer. However, if you are printing with your own settings, make sure that you have the retraction settings configured correctly.</div>
<h3>PrusaSlicer settings</h3>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted-600x359.jpeg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted-800x479.jpeg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted-300x179.jpeg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted-768x459.jpeg 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted-1536x919.jpeg 1536w, https://cdn.help.prusa3d.com/wp-content/uploads/2022/02/432d664dd4b64d78_painted.jpeg 1600w" alt="" width="700" height="419"></p>
<p>You should start by checking a parameter known as Retraction. What does retraction do? When the extruder has finished printing one section/object of your g-code, the filament is pulled back into the nozzle. Once the extruder moves to the next location the printing process continues – the filament is pushed back out and it starts extruding from the nozzle again. Retraction settings can be found in PrusaSlicer in <em>Printer Settings -&gt; Extruder 1</em>.</p>
<p>Flexible filaments usually need longer retractions, because the material stretches while being pulled back to the nozzle. Flexible materials are a special case and can need a lot of tweaking and tuning.</p>
<p><strong>The retraction settings are:</strong></p>
<ul>
<li><strong>Retraction length:</strong> Amount that the filament is pulled back when a retraction is triggered. <strong>On the MK2.5/S and MK3/S/+, the retraction length should be a maximum of 2 mm.</strong></li>
</ul>
<div class="tip-callout">Due to the Bowden extruder, the retraction length of the Original Prusa MINI/MINI+ presets are much longer (default 3.2 mm).</div>
<ul>
<li><strong>Lift z:</strong> lifts the extruder during movement. Having this setting lower will improve stringing. Note that disabling this feature may cause the nozzle to hit the printed part.<strong><br /></strong></li>
<li><strong>Retraction Speed:</strong> Extruder motor speed on retraction. A higher value improves stringing, but if it is too high it may skip steps in the motor.</li>
<li><strong>Minimum travel after retraction:</strong> Amount of move that will trigger a retraction (mm). The preset number in PrusaSlicer is 1 mm, which is a low amount. Having this number higher will get lower printing times, but increase oozing and stringing.</li>
<li><strong>Retract on layer change:</strong> Activates retraction when the layer changes to the next one. It is recommended to leave this option on.</li>
<li><strong>Wipe while retracting:</strong> Moves the nozzle (wipe) while the retraction is happening. It is recommended to leave this option on.</li>
<li><strong>Retract amount before wiping:</strong> This option does a quick retract before doing the wiping movement. More suitable for the Original Prusa MINI/MINI+.</li>
</ul>
<p><strong>Other settings that affect retraction:</strong></p>
<ul>
<li><strong>Only retract when crossing perimeters:</strong> <em>(Print settings -&gt; Infill -&gt; Advanced):</em> Disables retraction when the travel path does not exceed the upper layer's perimeter. Any oozing that happens will be within the walls and should be invisible.</li>
<li><strong>Avoid crossing perimeters:</strong> <em>(Print settings -&gt; Layers and perimeters -&gt; Quality):</em> Optimize travel moves in order to minimize the crossing of perimeters. This will lower the stringing amount, especially in the MINI/MINI+.</li>
<li><strong><a href="http://help.prusa3d.com/article/sequential-printing_124589">Sequential printing</a>:</strong> <em>(Print settings -&gt; Output options -&gt; Sequential printing):</em> Printing each object individually has a smaller chance of causing stringing between the parts. When using this feature, PrusaSlicer will warn you of any possibility of the extruder colliding with an already printed part, but follow the print closely.</li>
<li><strong>Nozzle temperature:</strong> <em>(Filament settings -&gt; Filament -&gt; Nozzle):</em> Lowering the temperature decreases the occurrence of strings. Try decreasing the nozzle temperature by 5 – 10°C and check whether there’s less stringing.</li>
</ul>
<h3>Filament</h3>
<p>Try using a different spool than the one that is causing the stringing. The filament might have gathered moisture, which will cause a lot of stringing.</p>
<h3>Hotend</h3>
<p>Stringing in the nozzle might be caused by a heat dissipation issue in the nozzle. Try <a href="http://help.prusa3d.com/guide/how-to-replace-a-heatbreak-heatsink-heaterblock-mk3s-mk3s-mk2-5s-mmu2s_16104">re-applying thermal paste</a> on the threads between the heatbreak and the heatsink.</p>
<p>If you have recently changed any component in the hotend, it is also possible that some individual parts are not in place. Go over the assembly of the hotend and check for any parts that may be different from the <a href="http://help.prusa3d.com/guide/how-to-replace-a-heatbreak-heatsink-heaterblock-mk3s-mk3s-mk2-5s-mmu2s_16104">instructions</a>.</p>
<h3>Enough settings, pass me my <strong>heat-gun!</strong></h3>
<p>If you don’t feel like tweaking any of the settings, well, then there is an alternative. You can get rid of the strings with a heat gun (or often with a lighter – but be very careful). Set your heat-gun to around 200 °C and aim at the strings for one or two seconds. This will melt the strings, and the printed object should remain undamaged. Do not leave the heat source on the printed model for longer than one or two seconds, as this may deform the part.</p>


Stringing and oozing

<div><strong><img decoding="async" loading="lazy" style="float: right;" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-768x768.jpg 768w" alt="" width="225" height="225"></strong></div>
<h3>Basic info</h3>
<div><strong>PETG</strong> is one of the most easily printable materials, it is <strong>inexpensive and suitable for beginners</strong>. Relatively high tenacity and temperature resistance make it <strong>suitable for printing technical parts</strong> (for example parts of our printers).</div>
<div>&nbsp;</div>
<div><strong>Recommended nozzle temperature:</strong> 230 °C for the first layer, 240 °C for the other layers</div>
<div>&nbsp;</div>
<div><strong>Recommended bed temperature:</strong> 85 °C for the first layer, 90 °C for the other layers</div>
<div>&nbsp;</div>
<div><strong>Heatbed:</strong> Using powder-coated TXT or satin sheet is highly recommended. Printing on smooth PEI surface might damage the sheet.</div>
<h3>Description</h3>
<div>
<p><a href="https://www.prusa3d.com/category/prusament-petg/"><strong data-stringify-type="bold">PETG</strong></a> (Polyethylene Terephthalate modified with Glycol) is a commonly used technical material, popular among 3D printer users for its <strong>low price and good printability</strong>. It’s tenacious, with good temperature resistance; PETG is most commonly used for printing various mechanical parts, holders, clamps, and waterproof parts (thanks to great layer adhesion).</p>
<p>PETG has a glossy surface, adheres greatly to a print sheet, and <strong>does not shrink or warp</strong> (it has very little thermal expansion), therefore it’s suitable for printing large models. Plus, its high tenacity and flexibility often <strong>prevent it from breaking.</strong> Due to good temperature resistance, PETG parts are suitable both for interior and most exterior use (with temperatures below 80 °C). <strong>Parts of our printers are made of PETG!</strong></p>
<p>The letter G in PETG means that it’s modified with glycol during the manufacturing process. Glycol makes PET less brittle, easier to print, and more transparent for translucent prints. Of course, you can print also with PET filaments without glycol. However, printing with only PET is challenging and does not offer any advantage whatsoever.</p>
<div class="warning-callout">Even though PETG in itself may be considered <a href="http://help.prusa3d.com/article/food-safe-fdm-printing_112313">food-safe</a>, it consists of layers, as every 3D print, in which bacteria can grow over time. You can prevent this by applying a <strong>food-safe(epoxy) coating.</strong> Also, a stainless-steel nozzle should be used for if food is the intended application.</div>
<p>Although <strong>PETG</strong> is frequently used in <strong>food industry</strong> and is considered <strong>food-safe</strong>, we do not recommend it (or any other filament) for printing dishes or other stuff that comes into direct contact with food. The main reason is tiny print layer surface grooves that can support numerous bacterial colonies. But if you still want 3D printed dishes, we suggest <strong>applying a special layer</strong> that seals the surface (food-safe coating) and printing with a clean steel nozzle.</p>
<p>Some of the manufacturers <strong>enrich PETG with various additives</strong> and sell these materials under different names. For example, Spoolworks EDGE by E3D is modified PET/Copolyester Blend with additives. The goal is to acquire better visual qualities, surface and layer adhesion, etc.</p>
<p>To compare supported material properties, see our <a href="https://help.prusa3d.com/en/materials">material table.</a></p>
</div>
<table class="striped">
<tbody>
<tr>
<th>
<p>Pros</p>
</th>
<th>
<p>Cons</p>
</th>
</tr>
<tr>
<td>
<p>✔ Easy to print</p>
</td>
<td>
<p>✖ Possibility of stringing</p>
</td>
</tr>
<tr>
<td>
<p>✔ Good layer adhesion</p>
</td>
<td>
<p>✖ Poor bridging and overhangs</p>
</td>
</tr>
<tr>
<td>
<p>✔ Tough and durable</p>
</td>
<td>
<p>✖ Not great for printing detailed parts</p>
</td>
</tr>
<tr>
<td>
<p>✔ Low warping</p>
</td>
<td>
<p>✖ Bonds strongly to the print surface</p>
</td>
</tr>
<tr>
<td>✔ High temperature-resistance</td>
<td>
<p>✖ Soluble in dangerous chemicals</p>
</td>
</tr>
<tr>
<td>✔ Water and humidity resistant</td>
<td>
<p>✖ Supports are hard to remove</p>
</td>
</tr>
</tbody>
</table>
<h3>Best use</h3>
<p>PETG is used universally but is especially suitable for mechanical parts for both indoor and outdoor use. We use PETG to print parts for our printers! Plastic bottles are also made from this kind of material.</p>
<h3>Tips for successful printing</h3>
<p><strong>Temperature settings and cooling</strong></p>
<p>Unlike PLA, <strong>PETG requires a heated bed (85 °C).</strong> Its bridging- and overhang-behavior is usually worse, plus it is prone to stringing. Stringing can be moderated with higher retractions and lower nozzle temperature, but we suggest <strong>using the PrusaSlicer profiles that should work fine.</strong> It’s important to <strong>cool the PETG print</strong> - this helps to keep the model detailed and prevents stringing and oozing. But if you want the model to be as tough as possible, try to turn off the print fan. Higher filament temperature improves merging between layers which leads to better mechanical resistance. Otherwise, we recommend printing the first few layers with the print fan off to prevent deformation, then with the fan running at half its power.</p>
<div class="warning-callout"><strong>Do not print on the smooth PEI sheet</strong> as the adhesion may be too strong!</div>
<p><strong>Print surface preparation</strong></p>
<p>Make sure the print surface is clean, as described in <a href="http://help.prusa3d.com/article/first-layer-issues_1804">our dedicated article</a>. It is advisable to use one of the <strong>powder-coated print sheets. Do not print on the smooth PEI sheet</strong> as the adhesion may be too strong! If you decide to use the smooth PEI sheet anyway, apply a glue stick on it before printing.</p>
<p><strong>Adding more perimeters for more solid parts</strong></p>
<p>If you want to print truly solid parts, <strong>try to increase the number of perimeters</strong> instead of adding more infill.</p>
<h3>Postprocessing</h3>
<p>PETG can be easily sanded both dry and wet.</p>
<p><strong>Dissolving PETG</strong></p>
<p><strong>Dissolving and smoothing PETG</strong> is possible only in a laboratory by skilled lab workers using <strong>dangerous chemicals</strong> (Dichloromethane).</p>
<h3>Sample prints</h3>
<table style="border-collapse: collapse; width: 100%; height: 954px;" border="0">
<tbody>
<tr style="height: 300px;">
<td style="width: 48.805%; height: 300px;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-1-1.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-1-1-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-1-1-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-1-1-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-1-1-768x768.jpg 768w" alt="" width="800" height="800"></td>
<td style="width: 48.805%; height: 300px;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-jet-black-1kg.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-jet-black-1kg-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-jet-black-1kg-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-jet-black-1kg-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-jet-black-1kg-768x768.jpg 768w" alt="" width="800" height="800"></td>
</tr>
<tr style="height: 18px;">
<td style="width: 48.805%; height: 18px; text-align: center;"><em>MMU (Multi-Material Unit)</em></td>
<td style="width: 48.805%; height: 18px; text-align: center;"><em>Electronics cover and other printer parts</em></td>
</tr>
<tr style="height: 300px;">
<td style="width: 48.805%; height: 300px;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-2.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-2-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-2-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-2-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-2-768x768.jpg 768w" alt="" width="800" height="800"></td>
<td style="width: 48.805%; height: 300px;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-3.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-3-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-3-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-3-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-prusa-orange-1kg-3-768x768.jpg 768w" alt="" width="800" height="800"></td>
</tr>
<tr style="height: 18px;">
<td style="width: 48.805%; height: 18px; text-align: center;"><em>Ukulele</em></td>
<td style="width: 48.805%; height: 18px; text-align: center;"><em>Various mechanical parts</em></td>
</tr>
<tr style="height: 300px;">
<td style="width: 48.805%; height: 300px; text-align: center;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-1.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-1-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-1-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-1-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-1-768x768.jpg 768w" alt="" width="800" height="800"></td>
<td style="width: 48.805%; height: 300px; text-align: center;"><img decoding="async" loading="lazy" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-400x400.jpg 400w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-600x600.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-300x300.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/prusament-petg-urban-grey-1kg-768x768.jpg 768w" alt="" width="800" height="800"></td>
</tr>
<tr style="height: 18px;">
<td style="width: 48.805%; height: 18px; text-align: center;"><em>Electronic parts</em></td>
<td style="width: 48.805%; height: 18px; text-align: center;"><em>Boxes and organizers</em></td>
</tr>
</tbody>
</table>


PETG

Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade

Original Prusa MK4/MK3.9 to MK4S/MK3.9S upgrade

Assembly manuals

Basic calibration

Advanced calibration

All information you need to know to learn how to calibrate your 3D printer to achieve perfect prints.

Calibration

Printer description

Printer features

FAQs and other useful information you might be interested in before or after making your purchase at shop.prusa3d.com

General Information

Basic overview of your 3D printer and it's features, plus general Prusa Research info.

About your printer

3D models

Material guide

Printer maintenance

Prusa Connect & PrusaLink

In this section, you can find material guides, printer troubleshooting and general info about using your printer.

Using the printer

Print Quality Troubleshooting

QR Error codes

Printer troubleshooting

Description of how to recognize and solve common problems, especially hardware and electronics related.

Troubleshooting

Nozzles

Octoprint

Learn about different nozzles, Raspberry Pi connection, Octoprint and more.

3rd party accessories & Other projects

About PrusaSlicer

Configuration and profiles

User interface

Input/output

Top toolbar

Print settings

Filament settings

Printer settings

Advanced features

The official documentation for the PrusaSlicer slicing software. From basic configuration to advanced settings like modifier meshes.

PrusaSlicer

1. Introduction

1a. Parts check

2. Upgrading the Y-axis

3. Upgrading the xLCD

1b. Printer disassembly

1c. Parts preparation

4. Upgrading the Nextruder

2. Frame assembly

4B. Upgrading the Nextruder (MMU3)

3. X-axis & X-carriage assembly

5. Upgrading the connectivity

6. Preflight check

4. Z-axis assembly

Manual changelog

5. Nextruder assembly

6. xLCD assembly

7. Y-carriage & Heatbed assembly

8. Preflight check

<p>Each Original Prusa printer is shipped with a bundle of sample G-codes. These G-codes are tested and tailored specifically for your printer model and can be used to see the printer's capabilities or troubleshoot.</p>
<p>Find your printer in the table and download the zip archive. The model geometry (.stl/.3mf) and the presliced version (.gcode) are included.</p>
<div class="tip-callout">You can find all our sample prints, including the printable parts of our printers, on our <a href="https://www.printables.com/@Prusa3D/collections/">Printables page</a>.</div>
<h2>Original Prusa FFF Series</h2>
<table class="striped" style="width: 100%; height: 639.687px;">
<tbody>
<tr style="height: 21.3333px;">
<td style="width: 33.1288%; height: 21.3333px; text-align: left;"><strong>Printer model</strong></td>
<td style="width: 16.9325%; text-align: left; height: 21.3333px;"><strong>Printer type</strong></td>
<td style="width: 25.0307%; height: 21.3333px; text-align: left;"><strong>3D models</strong></td>
<td style="width: 25.0307%; text-align: left; height: 21.3333px;"><strong>G-codes</strong></td>
</tr>
<tr style="height: 20.8889px;">
<td style="width: 33.1288%; height: 20.8889px;">CORE One</td>
<td style="width: 16.9325%; height: 20.8889px;">FFF</td>
<td style="width: 25.0307%; height: 20.8889px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/COREOne_Sample_Models.zip">link</a></td>
<td style="width: 25.0307%; height: 20.8889px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/COREOne_Sample_Gcodes.zip">link</a></td>
</tr>
<tr style="height: 27.1944px;">
<td style="width: 33.1288%; height: 27.1944px;">MK4S/MK3.9S</td>
<td style="width: 16.9325%; height: 27.1944px;">FFF</td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK4S-MK39S-3dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK4S-MK3.9S-gcodes.zip">link</a></td>
</tr>
<tr style="height: 27.1944px;">
<td style="width: 33.1288%; height: 27.1944px;">MK4/MK3.9</td>
<td style="width: 16.9325%; height: 27.1944px;">FFF</td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK4-MK39-3dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK4-MK39-gcodes.zip">link</a>*</td>
</tr>
<tr style="height: 28.7986px;">
<td style="width: 33.1288%; height: 28.7986px;">MK3.5/S</td>
<td style="width: 16.9325%; height: 28.7986px;">FFF</td>
<td style="width: 25.0307%; height: 28.7986px;">TBA</td>
<td style="width: 25.0307%; height: 28.7986px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3.5-S_Sample_Gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MK3S+</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3family-3dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3S%2B_MK3S_MK3-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MK3S</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3family-3dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3S%2B_MK3S_MK3-gcodes.zip">link</a></td>
</tr>
<tr style="height: 27.1944px;">
<td style="width: 33.1288%; height: 27.1944px;">MK3</td>
<td style="width: 16.9325%; height: 27.1944px;">FFF</td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3family-3dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3S%2B_MK3S_MK3-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MINI+</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MINI%2B_MINI-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MINI%2B_MINI-gcodes.zip">link</a></td>
</tr>
<tr style="height: 27.1944px;">
<td style="width: 33.1288%; height: 27.1944px;">MINI</td>
<td style="width: 16.9325%; height: 27.1944px;">FFF</td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MINI%2B_MINI-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MINI%2B_MINI-gcodes.zip">link</a></td>
</tr>
<tr style="height: 27.1944px;">
<td style="width: 33.1288%; height: 27.1944px;">XL 1T</td>
<td style="width: 16.9325%; height: 27.1944px;">FFF</td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-1T-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-1T-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">XL 2T</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-2T-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-2T-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">XL 5T</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-5T-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/XL-5T-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MMU3 &amp; MK4</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU3-MK4-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU3-MK4-gcodes.zip">link</a></td>
</tr>
<tr style="height: 27.1944px;">
<td style="width: 33.1288%; height: 27.1944px;">MMU3 &amp; MK4S</td>
<td style="width: 16.9325%; height: 27.1944px;">FFF</td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU3-MK4S-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU3-MK4S-gcodes.zip">link</a></td>
</tr>
<tr style="height: 27.1111px;">
<td style="width: 33.1288%; height: 27.1111px;">MMU3 &amp; MK3S/+</td>
<td style="width: 16.9325%; height: 27.1111px;">FFF</td>
<td style="width: 25.0307%; height: 27.1111px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU3-MK3S-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 27.1111px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU3-MK3S-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MMU2S &amp; MK3S/+</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU2S_MMU2-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3S%2B_MK3S_MMU2S-gcodes.zip">link</a></td>
</tr>
<tr style="height: 27.1944px;">
<td style="width: 33.1288%; height: 27.1944px;">MMU2S &amp; MK2.5S</td>
<td style="width: 16.9325%; height: 27.1944px;">FFF</td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU2S_MMU2-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK25S_MMU2S-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MMU2 &amp; MK3</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU2S_MMU2-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK3_MMU2-gcodes.zip">link</a></td>
</tr>
<tr style="height: 27.1944px;">
<td style="width: 33.1288%; height: 27.1944px;">MMU2 &amp; MK2.5</td>
<td style="width: 16.9325%; height: 27.1944px;">FFF</td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU2S_MMU2-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 27.1944px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK25_MMU2-gcodes.zip">link</a></td>
</tr>
<tr style="height: 36px;">
<td style="width: 33.1288%; height: 36px;">MMU1 &amp; MK2</td>
<td style="width: 16.9325%; height: 36px;">FFF</td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MMU1-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 36px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/MK2MMU-gcodes.zip">link</a></td>
</tr>
</tbody>
</table>
<p><em>*The archive includes G-codes for both MK4 and MK3.9 printers. G-codes are sliced for Input Shaper and older non-Input Shaper firmware. To print the Input Shaper G-codes, please make sure your printer is running <a href="https://help.prusa3d.com/downloads">firmware 5.0.0 or newer</a>.</em></p>
<h2>Original Prusa SLA Series</h2>
<table class="striped" style="width: 100%; height: 73px;">
<tbody>
<tr style="height: 21px;">
<td style="width: 33.1288%; height: 21px; text-align: left;"><strong>Printer model</strong></td>
<td style="width: 16.9325%; text-align: left; height: 21px;"><strong>Printer type</strong></td>
<td style="width: 25.0307%; height: 21px; text-align: left;"><strong>3D models</strong></td>
<td style="width: 25.0307%; text-align: left; height: 21px;"><strong>G-codes</strong></td>
</tr>
<tr style="height: 21px;">
<td style="width: 33.1288%; height: 21px;">Original Prusa SL1S</td>
<td style="width: 16.9325%; height: 21px;">MSLA</td>
<td style="width: 25.0307%; height: 21px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/SL1S-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 21px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/SL1S-gcodes.zip">link</a></td>
</tr>
<tr style="height: 21px;">
<td style="width: 33.1288%; height: 21px;">Original Prusa SL1</td>
<td style="width: 16.9325%; height: 21px;">MSLA</td>
<td style="width: 25.0307%; height: 21px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/SL1-3Dmodels.zip">link</a></td>
<td style="width: 25.0307%; height: 21px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/SL1-gcodes.zip">link</a></td>
</tr>
</tbody>
</table>
<h2>Prusa Pro FFF Series</h2>
<table class="striped" style="width: 100%; height: 31px;">
<tbody>
<tr style="height: 21px;">
<td style="width: 33.1288%; height: 21px; text-align: left;"><strong>Printer model</strong></td>
<td style="width: 16.9325%; text-align: left; height: 21px;"><strong>Printer type</strong></td>
<td style="width: 25.0307%; height: 21px; text-align: left;"><strong>3D models</strong></td>
<td style="width: 25.0307%; text-align: left; height: 21px;"><strong>G-codes</strong></td>
</tr>
<tr style="height: 10px;">
<td style="width: 33.1288%; height: 10px;">Prusa Pro HT90</td>
<td style="width: 16.9325%; height: 10px;">FFF</td>
<td style="width: 25.0307%; height: 10px;">TBA</td>
<td style="width: 25.0307%; height: 10px;"><a href="https://www.prusa3d.com/downloads/SampleModelsGcodes/HT90-gcodes.zip">link</a></td>
</tr>
</tbody>
</table>
<p> </p>


Sample G-codes

<p>As there are ways of remotely transferring files and starting prints, an SD card or USB flash drive is the most common and reliable way to get your files to your machine. Though common and convenient, flash memory is not the most reliable in itself and your storage can be corrupted or fill up without any obvious signs. Therefore, we have put together a small guide on how to maintain, format, and purchase memory for your Original Prusa printer.</p>
<h3>Make sure your SD card is not locked!</h3>
<p>The SD card has a latch on the side. Before using your SD card, make sure that the latch is not set to the Locked position. In case it is locked, you will not be able to save files on the card, and the printer will not be able to open the SD card.</p>
<p><img decoding="async" style="max-height: 350px; display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-01.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-01-300x293.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-01-410x400.jpg 410w" data-hd-height="350px" data-hd-align="center"></p>
<h3>Storage over 32 GB</h3>
<p>There is no upper size limit on compatible storage media, but <strong>the built-in Windows formatting tool does not support formatting storage media from a size of 32 GB or more to FAT32.</strong> It will only provide the option for exFAT, which is currently not supported by our printers. There are similar limitations under various versions of Apple's OSx, where a third-party application must be used to format it correctly.</p>
<p>To format such a drive you need a third-party application, like Rufus, FAT32 format, or EaseUS Partition Master. <strong>Be careful when using such programs</strong> so you do not <strong>accidentally format the wrong storage media</strong>, like your hard drive. However, 8-16 GB is more than enough for most use cases, as a G-code file rarely exceeds 100 MB.</p>
<h3>How do I format the USB drive/SD card?</h3>
<p>If your SD card or USB drive is full or if you can't read the content of the drive, but the drive is recognized by windows, most often all you need to do is to format the drive.</p>
<div class="note-callout">If your USB drive or SD card does not even show up in your computer file explorer it is probably corrupted beyond repair, or at least beyond the scale of this article. If you get an error like the one in the picture below and it does not show up anywhere, off to google you go, but you might have to consider this card/USB drive lost and get a new one.</div>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-02V3.jpg" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-02V3-600x238.jpg 600w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-02V3-800x317.jpg 800w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-02V3-300x119.jpg 300w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-02V3-768x304.jpg 768w" alt="" width="631" height="250"></p>
<h3>How to format on Windows</h3>
<p>On Windows, this is very simple. Locate your USB drive or SD card in my computer, right-click, and choose format.</p>
<p><img decoding="async" style="max-height: 350px; display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-03.png" sizes="100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-03-300x288.png 300w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-03-417x400.png 417w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-03-768x737.png 768w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-03-625x600.png 625w" data-hd-height="350px" data-hd-align="center"></p>
<p>A new small window will pop up. Most of the time you can simply leave everything to default, but the most important thing is that the <strong>File System is set to FAT32.</strong> This and the Volume Label (Name of the drive) is the only thing you want to touch here. Click Start and your drive will be formatted in a matter of seconds.</p>
<div class="warning-callout">Formatting any drive will delete all the content of the drive! Back up your stuff!</div>
<p><img decoding="async" style="max-height: 300px; display: block; margin-left: auto; margin-right: auto;" title="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-04-166x300.png 166w, https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-04-222x400.png 222w" src="https://cdn.help.prusa3d.com/wp-content/uploads/SD-cards-and-USB-flash-drives-04.png" data-hd-height="300px" data-hd-align="center"></p>
<div class="note-callout">If the USB stick will not work even after this procedure, it is either broken or its "partitioning scheme" is set as GPT, which is incorrect. <strong>It must be set as MBR (Master Boot Record).</strong> For how to change this, please see <a href="https://docs.microsoft.com/en-us/windows-server/storage/disk-management/change-a-gpt-disk-into-an-mbr-disk">Microsoft's official documentation</a>.</div>
<h3>How to format on Mac</h3>
<p>On Mac, it is a few more steps, but still very accessible. Again, you want to choose <strong>FAT32 as your file system</strong>, but you also have the option of changing the "partitioning scheme", which <strong>should always be MBR (Master Boot Record).</strong></p>
<div class="warning-callout">This process deletes all content from the drive.</div>
<ol>
<li>Plug the USB drive or SD card into your Mac.</li>
<li>Go to <em>Applications -&gt; Utilities</em> and launch <em>Disk Utility.</em></li>
<li>Click on the icon in the top-left (<span style="color: #2dc26b;">green arrow</span>) and select "Show All Devices" from the drop-down menu.</li>
</ol>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted.png" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted-600x271.png 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted-800x361.png 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted-300x135.png 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted-768x347.png 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted-1536x693.png 1536w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b49c3bac01f2fd71_painted.png 1600w" alt="" width="500" height="226"></p>
<p style="text-align: center;"><em>macOS Big Sur 11.6</em></p>
<ol start="4">
<li>Right-click on the USB drive/SD card in the sidebar under "External". <em>Select the top entry for your drive, not a partition located below.</em></li>
<li>Select Erase in the Disk Utility-toolbar (<span style="color: #b96ad9;">purple arrow</span>).</li>
</ol>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted.png" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted-600x271.png 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted-800x361.png 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted-300x135.png 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted-768x347.png 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted-1536x693.png 1536w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/b04f0e7375dfbc17_painted.png 1600w" alt="" width="500" height="226"></p>
<p style="text-align: center;"><em>macOS Big Sur 11.6</em></p>
<ol start="6">
<li>Enter a name for the formatted disk.</li>
<li>Click on the Format menu and choose MS-DOS (FAT).</li>
<li>Make sure the Scheme is set to "Master Boot Record".</li>
</ol>
<p><img decoding="async" loading="lazy" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01.png" sizes="(min-width: 1024px) 820px, 100vw" srcset="https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-600x301.png 600w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-800x401.png 800w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-300x150.png 300w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-768x385.png 768w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-1536x771.png 1536w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01-2048x1027.png 2048w, https://cdn.help.prusa3d.com/wp-content/uploads/2021/10/snmek-obrazovky-2021-10-07-v8-32-01.png 1600w" alt="" width="500" height="251"></p>
<p style="text-align: center;"><em>macOS Big Sur 11.6</em></p>
<ol start="9">
<li>Click Erase.</li>
<li>Your USB drive will now be erased and re-formatted correctly.</li>
</ol>
<div class="tip-callout">If your SD card is not detected by the printer at all, be sure to check out <a href="http://help.prusa3d.com/article/sd-card-not-working_2095">SD card not working</a> for further information.</div>

SD cards and USB drives

<p>The blob (mass of plastic accumulated around the hotend) is one of the most scary-looking printing problems you might face with your 3D printer. Removing it after it happens is quite tricky, though not impossible.</p>
<div class="warning-callout">Please note that damage caused by the blob is <strong>not covered by the warranty</strong> as it is neither hardware nor software related. It can be prevented by properly calibrating the printer as well as by stopping the print as soon as the filament starts to stick to the nozzle.<br />See the <strong>Safety Instructions</strong> on the 3D Printing Handbook bundled with each of our printers. <strong>Do not leave the printer unattended while it's switched on.</strong></div>
<p>We prepared a short video on how to remove an extruder blob. The video features our Original Prusa MK3, but the same principles of heating the filament blob in order to soften it and carefully removing it with pliers <strong>apply to all our FDM printer models.</strong> </p>
<h3>How to clear the extruder blob</h3>
<p style="text-align: center;"><iframe src="https://www.youtube.com/embed/mSmJKjibMT0" width="560" height="315" frameborder="0" allowfullscreen="allowfullscreen" loading="lazy"></iframe></p>
<div class="warning-callout">Before doing anything, please note that the cables of the hotend thermistor and the heater cartridge are most likely entangled in the blob. The heater cartridge cable in particular is very vulnerable as <strong>its insulation ends before the wire enters the cartridge body. </strong></div>
<ol>
<li>Preheat the nozzle in the <em>LCD Menu -&gt; Settings/Control -&gt; Temperature -&gt; Nozzle</em>. The temperature needs to be approximately 30°C higher than the temperature at which the blob has formed. For example, if the blob is made of:
<ul style="list-style-type: square;">
<li><strong>PLA: </strong>preheat to 250<strong>°</strong>C</li>
<li><strong>ABS/PETG:</strong> preheat to 280<strong>°</strong>C</li>
</ul>
</li>
</ol>
<div class="note-callout">On MK3/S/+, it is also possible to preheat the printer through the <em>Preheat</em> menu, but note that a <a href="http://help.prusa3d.com/article/thermal-model-calibration_382488">Thermal anomaly error</a> might happen.</div>
<ol>
<li>If <a href="http://help.prusa3d.com/article/mintemp-error-and-mintemp-bed_2169">MINTEMP</a> or <a href="http://help.prusa3d.com/article/preheat-error_2163">Preheat error</a> message appears on the LCD, it means the thermistor or the heater cable (respectively) is already broken. In this case, your only option is to use a heat gun to heat the plastic. Work very carefully, you don't want to melt the printed parts surrounding the hotend. Clear the blob little by little.</li>
<li>After the hotend reaches the right temperature, leave it this way for at least 5 minutes. <strong><em>Turn the printer off before the next step, or you might cause an electrical short.<br /></em></strong></li>
<li>Smaller blobs will start to fall off by themselves. As for the bigger ones, use a pair of pliers to remove the now soft plastic mass from the hotend carefully. Again, be very cautious around the leads coming from the hot end, in particular, the thermistor leads.<em><strong><br /></strong></em></li>
<li>Once the big chunks of the amassed plastic are removed, use a small brass brush to get rid of what's left (as shown in the video above).</li>
<li>In case you do not succeed, as well as in case the blob has damaged some of the extruder parts, you can find your spare parts <a href="https://shop.prusa3d.com/en/18-spare-parts">here</a>. To see the spare parts section, you have to be logged into the account you used to purchase the printer.</li>
</ol>
<h3><strong>How to prevent this problem from happening</strong></h3>
<p>Unlike the <a href="http://help.prusa3d.com/article/spaghetti-monster_1999">Spaghetti monster</a> issue, the blob issue often occurs early during the print. In general, the blob forms if the first layer detaches from the print surface and sticks to the moving hot nozzle while it keeps extruding, causing the blob to grow.</p>
<p>In order to prevent this situation from happening, bear in mind these simple rules:</p>
<ul>
<li>Always make sure to <strong>clean the print surface</strong> before starting the print. See <a href="http://help.prusa3d.com/article/first-layer-issues_1804"><u>this guide</u></a> for more details.</li>
<li>Take the time to <a href="http://help.prusa3d.com/article/first-layer-calibration-i3_112364"><u>adjust the first layer height</u></a> at the beginning of the print. Make sure that the first layer is sticking properly to the entire print surface.
<div class="tip-callout">This step does not apply to Original Prusa MK4, MK3.9, XL, as they are equipped with <a href="http://help.prusa3d.com/article/loadcell-mk4-s-mk3-9-s-xl_401253">loadcell</a>, although minor first layer adjustment is still possible on these printers. </div>
</li>
<li><strong>Check the print every now and then.</strong> If you observe any potential problem, pause the print and give yourself the time to solve it. As a last resort, you can always stop the print, adjust the settings, and start again.</li>
</ul>
<h3>Silicone sock</h3>
<p>Consider installing a <a href="http://help.prusa3d.com/article/nextruder-silicone-sock-xl-mk4-mk3-9_641415">silicone sock</a>. This is <a href="https://www.prusa3d.com/product/prusa-nextruder-silicone-sock-set/">available in our shop</a> for <strong>MK4/S</strong>, <strong>MK3.9/S</strong>, and <strong>XL</strong>. Although the component does not prevent extruder blobs, in case this occurs, it makes it easier to remove it. </p>


Extruder blob

<h3>Why the name spaghetti monster?</h3>
<p>This print issue looks exactly like it sounds, a big mess of "spaghetti" on and around your print<strong>.</strong> It is actually extruded filament, which was misplaced by the print head (extruder) because at a certain point during the print the object below moved or collapsed.</p>
<div class="tip-callout">If the first layer isn’t perfect, the chance of any type of print failure increases.</div>
<h3>The most common reasons</h3>
<ol>
<li>The printed object detaches from the print bed during the print</li>
<li>The printed object collapses during the print</li>
<li>An error within the 3D model and/or the sliced file</li>
</ol>
<p><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/prusuki/prusuki-images/spaghetti-1024-x-577-jpg"></p>
<h3><strong>Troubleshooting</strong></h3>
<ul>
<li><strong>Check the first layer</strong> – Simply make sure that the first layer is sticking properly to the whole print surface. You can refer to <a href="http://help.prusa3d.com/article/first-layer-issues_1804">First layer issues</a>.</li>
<li><strong>Check the object for errors</strong>&nbsp;– Always check the generated G-code in the&nbsp;<strong>Preview</strong>&nbsp;of our&nbsp;<strong>PrusaSlicer</strong>. PrusaSlicer will also display a small warning triangle next to the model should it find any obvious issues. In case you find any gaps or broken geometry, you can either repair the STL object yourself and check our article <a href="http://help.prusa3d.com/article/corrupted-3d-models-for-printing_2205">Corrupted 3D models for printing</a>.</li>
<li><strong>Try to increase the bed temperature</strong> – If you have already experienced this error, try to re-run the print and increase the bed temperature by 5-10 <strong>°</strong>C. This should help with the first layer adhesion. You don’t have to re-slice the object and prepare a new G-code. Just start the print, go to the&nbsp;<em>LCD Menu – Tune – Bed,</em> once the mesh bed leveling is completed<strong>.</strong></li>
</ul>


Spaghetti monster

<p>The <strong>filament sensor</strong> equipped on the <strong>Original Prusa MK4/S, </strong><strong>Original Prusa MK3.9/S, and each tool of Original Prusa XL</strong> detects the presence of a filament and filament run-out. The sensor is a Hall sensor, triggered by a mechanism composed of a spring, a magnet, and a ball. </p>
<p>If an MK4/S or MK3.9/S is upgraded to the MMU3, some of the Nextruder components are modified, including the mechanism that triggers the filament sensor. In these printer versions, the mechanism does not rely on a system of spring, magnet, and ball, but is based on the idler tension bolt. </p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/06/961d724774263fdc78c6b50694c1bede_painted.jpeg" alt="" width="500" height="375" loading="lazy" /></p>
<h3>Check assembly (MK4/S, MK3.9/S)</h3>
<p>If your printer is an <strong>MK4</strong> or <strong>MK3.9</strong>, you have received a package with magnets for the <a href="http://help.prusa3d.com/guide/5-nextruder-assembly_434014">assembly</a>. On MK4S and MK3.9S, this subcomponent comes pre-assembled in the heatsink.</p>
<p>Note that two magnets are sent, but one is meant to be used in the assembly, and the other is a spare. If your filament sensor does not work, check if two magnets have not been added by accident.</p>
<table style="border-collapse: collapse; width: 100.0%; height: 20.8px;" border="0">
<tbody>
<tr style="height: 20.8px;">
<td style="width: 48.7906%; height: 20.8px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/ce79d19c2b7f073247216deb1a06d29b.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4, MK3.9, XL)" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.7906%; height: 20.8px;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/e5fa0bc557e7822ea3d544fda40735da.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4, MK3.9, XL)" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h3>How to clean the filament sensor</h3>
<p>During usage, filament residue might build up around the sensor or its mechanism, possibly causing false readings and thus malfunctioning.</p>
<h4>1) Compressed air</h4>
<p>At the top of the extruder is a small hole, insert the tip of a compressed air can in the hole. With your free hand, prepare a bit of filament with a non-stringy tip. Repeatedly insert and remove the filament from the extruder, while blowing the compressed air. This will dislodge the build-up debris.</p>
<p style="text-align: center;"><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/08/5ac2eee63621ff1e9030242fe03fa27c.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="500" height="376" loading="lazy" /><em>Top view of the MK4 print head. The XL print head has a similarly positioned small hole.</em> </p>
<h4>2) Filament tip insertion</h4>
<p>In case you don't have compressed air at hand, a similar procedure to the one above can be attempted.</p>
<p>Prepare a bit of filament with a non-stringy tip. Repeatedly insert and remove the filament from the extruder. It will be necessary to insert and remove the bit of filament several times to achieve good cleaning, and the technique might not always be effective. </p>
<h4>3) Removing the sensor (MK4/S, MK3.9/S)</h4>
<div class="warning-callout"><strong>The following procedure is NOT recommended on Original Prusa XL</strong>. If you are experiencing issues with the tool filament sensor readings, and the previous methods did not work, please contact our <a href="http://help.prusa3d.com/article/customer-support_2287">technical support</a>, and we will guide you through the procedure in more detail. </div>
<div>If the previous techniques do not work, the filament sensor can be removed to be manually cleaned. This procedure requires partial disassembly of the E-axis. </p>
<p>Ensure to have the <strong>PG-assembly-adapter</strong> before continuing with the following procedure. If you do not have it, you can print it using the below files, depending on the printer you will use: <br /><a href="https://files.printables.com/media/prints/451501/stls/4104840_55cb7d05-d1f6-4cca-8159-db9ac9f62942/pg-assembly-adapter-mk4-r1.stl?_gl=1*1d00bdg*_ga*MTA4NDA4MDUzNi4xNjg0NTIwNjY3*_ga_3HK7B7RT5V*MTY5MjM1ODUwNC4yNTYuMS4xNjkyMzY0ODI0LjQ5LjAuMA..">PG-assembly-adapter printed with MK4</a><br /><a href="https://files.printables.com/media/prints/451501/stls/4240522_6fa05937-693e-4282-8dce-a98d3e93fd5f/pg-assembly-adapter-mk3-r2.stl?_gl=1*1d00bdg*_ga*MTA4NDA4MDUzNi4xNjg0NTIwNjY3*_ga_3HK7B7RT5V*MTY5MjM1ODUwNC4yNTYuMS4xNjkyMzY0ODI0LjQ5LjAuMA..">PG-assembly-adapter printed with MK3/S/+</a></p>
</div>
<ol>
<li>Unload the filament, then wait for the printer to fully cool down. After that, turn the printer off.</li>
<li>Remove the PG-case, together with the PG-ring, gearbox, and main plate. Remove all of these parts in one piece.</li>
</ol>
<table style="border-collapse: collapse; width: 100.0%;" border="0">
<tbody>
<tr>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/1c7df54642bb103d2a7d3ed01b41cbff_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/67c593556671a61a79c52036477d3454.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="3">
<li>Remove the <span style="color: #b96ad9;"><strong>Prusa-ball-holder</strong></span> using pliers.</li>
</ol>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/996ae1c0879279ce1b6ef35f1a255938_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="500" height="375" loading="lazy" /></p>
<ol start="4">
<li>Carefully remove the ball-magnet-spring combo from the Prusa-ball-holder and clean any debris out of it. Clean also the slot on the heatsink.</li>
</ol>
<table style="border-collapse: collapse; width: 100.0%;" border="0">
<tbody>
<tr>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/f45b4fba6e937fd81675038dcecea760.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.7906%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/889dc9c32adf0b651409f0322dbaf4bb.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="5">
<li>Reassemble the Prusa-ball-holder in the following order: steel ball, magnet, and spring.</li>
</ol>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/3503abc8b32f3010a3353ee5d62941ac_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament sensor (MK4)" alt="" width="500" height="375" loading="lazy" /></p>
<ol start="6">
<li>Reassemble the block with PG-case, PG-ring, gearbox, and main plate.</li>
</ol>
<div class="tip-callout">In case the disassembled parts in step 6 are not in one block, refer to <a href="http://help.prusa3d.com/guide/5-nextruder-assembly_434014#434652">steps 7-15 of the Nextruder assembly guide, part of the MK4 kit assembly guide</a>. </div>


Filament sensor (MK4/S, MK3.9/S, XL)

Prusa Connect &amp; PrusaLink

<h3>What happened? </h3>
<p>During the configuration of <strong>Prusa Connect</strong> on the <strong>Original Prusa MINI/+</strong>, <strong>MK4/S</strong>, <strong>MK3.9/S, MK3.5/S</strong> or <strong>XL</strong> an error on this configuration can occur and the printer shows the message "<strong>Registration to Prusa Connect failed due to: ~</strong>". In place of <strong>~</strong>, a text with more details is shown, from the list below. Depending on the specific shown text, there are different causes and fixes. </p>
<p>Error name: Connect Registration Failed</p>
<p>Error code: #12401 (MINI), #13401 (MK4), #26401 (MK4S), #21401 (MK3.9), #23401 (MK3.5), #17401 (XL)</p>
<h4>DNS error</h4>
<p>The printer wasn't able to resolve the <strong>hostname</strong> of the Prusa Connect server into an IP address. The hostname is a unique label assigned to a device connected to a network. </p>
<ul>
<li>The printer is not connected to the network at all.</li>
<li>In case of a <strong>static</strong> configuration (non-DHCP), the <strong>DNS server</strong> is not configured or configured incorrectly.</li>
<li>The local DNS server is currently not working.</li>
<li>The Connect hostname is reconfigured to some that doesn't exist. For example, this can occur if loading a .ini file with an invalid configuration.</li>
</ul>
<h4>Refused</h4>
<p>It's not possible to reach the server on the network level, hence it is not possible to establish a TCP connection. The system is either not answering at all or actively refuses the connection. </p>
<ul>
<li>The internet connection is not working, or a firewall blocks the communication.</li>
<li>In the case of a <strong>static</strong> configuration (non-DHCP), the <strong>gateway </strong>(typically, this is the IP address of the router) is not configured or configured incorrectly. </li>
<li>The Connect server is under maintenance. </li>
<li>Too many TCP connections are open with the printer, for example in PrusaLink. </li>
</ul>
<h4>TLS error</h4>
<p>This message points to an error doing a <strong>SSL/TLS handshake</strong>. This handshake is the process to create a safe and encrypted connection. </p>
<ul>
<li>Time is not synchronized on the printer (MINI/+). The time synchronization occurs for each internet connection, through the <a href="http://help.prusa3d.com/article/ntp-server-mini_151132">NTP server</a>. It is possible this might take more time than initially expected, or rarely, that there might be issues with the server. </li>
<li>A restrictive firewall (for example but not limited to a corporate proxy firewall) may restrict an automatic access to the NTP server. In that case, it will be necessary to manually allow the printer to access the NTP server.</li>
<li>Something in the path is trying to tamper with the communication, for example but not limited to an attack. </li>
</ul>
<h4>Unauthorized</h4>
<p>The server claims that the printer is not authorized. The printer is not recognized as an Original Prusa. </p>
<h4>Server error</h4>
<p>The server is returning a <strong>500 Internal Server Error</strong> or similar. The issue is on the Connect side, and is expected to be fixed on its own. </p>
<h4>Internal error</h4>
<p>This error is caused by an issue related to the printer firmware. </p>
<h4>Network error</h4>
<p>Similar to the Refused error, but the connection dropped after it was initialized. </p>
<ul>
<li>Glitchy internet connection.</li>
<li>The <strong>latency</strong> to the Connect servers is too high. A geographic location is very far from our Connect servers can contribute to this cause.</li>
<li>The Connect server is temporarily down.</li>
</ul>
<h4>Protocol error</h4>
<p>The response from the server is not recognized.</p>
<ul>
<li>Bug on the server side. This cause is on our side and expected to be fixed on its own. </li>
<li>Too old firmware on the printer and it's no longer supported.</li>
<li>A misconfiguration from the <strong>.ini file</strong> loaded on the printer, connecting to something different than our Connect server.</li>
</ul>
<h3>How to fix it? </h3>
<h4>DNS error, Refused</h4>
<p>Ensure that the printer is connected to the internet. In case of a static (non-DHCP) connection, ensure the correct settings are there, or test a DHCP connection. Also, check the .ini configuration file, and in case, rewrite the file. </p>
<p>If the previous steps didn't fix the issue, attempt a <a href="http://help.prusa3d.com/article/factory-reset-mini_177516">factory reset</a>. </p>
<h4>TLS error</h4>
<p>Reattempt the Connect registration, after the printer is connected to the internet for a few more minutes. </p>
<p>If the previous step didn't fix the issue, double-check your network <strong>firewall</strong>. Some firewalls will need for the NTP server to be allowed manually. The specific steps will depend on your specific firewall, we recommend checking your firewall documentation. </p>
<h4>Unauthorized</h4>
<p>If your printer is not an Original Prusa printer, it cannot use our Prusa Connect service.</p>
<p>In case your printer is an Original Prusa, <a href="http://help.prusa3d.com/article/firmware-updating-mini-mini_124784"> re-flash or update its firmware</a>. </p>
<h4>Server error</h4>
<p>A server error indicates an issue from our side. The issue will be fixed on its own, try registering again to Prusa Connect later. </p>
<h4>Internal error</h4>
<p><a href="http://help.prusa3d.com/article/firmware-updating-mini-mini_124784">Re-flash or update the printer firmware</a>. If this does not solve the issue, take note if the printer might have other issues, even if not directly related. </p>
<h4>Network error</h4>
<p>Ensure that your internet connection is stable and not glitchy. To confirm whether an inconsistent internet connection caused the issue, test another connection, if available, such as a hotspot from your mobile phone. </p>
<h4>Protocol error</h4>
<p>Ensure that the printer is running our latest firmware version. If it is running an old version, update the firmware. Also, check the .ini configuration file, and in case, rewrite the file.</p>


Connect Registration Failed

<p>The Prusa CORE One, and the Original Prusa XL, MK4/S, MK3.9/S are equipped with a <a href="http://help.prusa3d.com/article/loadcell-mk4-s-mk3-9-s-xl_401253">loadcell</a>. Thanks to this component, starting from firmware 6.0.0, the printer can detect whether the filament is stuck and not moving, for example when the nozzle is clogged. </p>
<p>If this is detected, the print pauses and the printer shows the message: "<strong>Stuck filament detected. The filament seems to be stuck. Please unload it from the extruder and load it again</strong>." </p>
<p>Once the <strong>unload </strong>button is pressed, the printer unloads the filament. After this, it prompts filament loading and resumes the print. </p>
<div class="tip-callout">It is important to note that detecting stuck filament is possible only inside the Nextruder, as pressure builds up from the nozzle to the upper part of the Nextruder. However, if your filament is tangled on the spool, there will be no internal pressure, just outside tension, which the loadcell won't recognize.</div>
<div>Stuck filament detection won't be possible on MK3.5 and MINI/MINI+ as they aren't equipped with the loadcell sensor.</div>
<p style="text-align: center;"><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/e884e31f8ae9e52017bacbeb8fcd544e.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Stuck filament detection #13101 (MK4) #21101 (MK3.9)" alt="" width="500" height="333" loading="lazy" /><em>Screenshot from the Original Prusa MK4</em></p>


Stuck filament detection #31101 (CORE One) #26101 (MK4S) #13101 (MK4) #27101 (MK3.9S) #21101 (MK3.9) #17108 (XL)

<p>This guide will help you solve the most common issues with the <a href="http://help.prusa3d.com/article/prusa-connect-and-prusalink-explained_302608">PrusaLink and Prusa Connect</a> on your Original Prusa Printer.</p>
<h3>Original Prusa MK4/S, MK3.9/S, MK3.5/S, XL, MINI/+</h3>
<p><strong>Wi-Fi connection status</strong></p>
<p>For the Original Prusa MK4/S, MK3.9/S, MK3.5/S, XL, MINI+, and MINI models, the Wi-Fi connection status is displayed at the top part of the LCD screen, indicated by an icon:</p>
<ul>
<li><strong>White Icon</strong> (<span style="color: #0000ff;"><strong>blue arrow</strong></span> in the image below): Indicates a successful Wi-Fi connection.</li>
<li><strong>Grey Icon</strong>: Wi-Fi is active but not connected to the access point.</li>
</ul>
<p>For detailed connection status, navigate to <strong>Settings &gt; Network &gt; Wi-Fi &gt; Status</strong> in the menu. (<span style="color: #e67e23;"><strong>orange arrow</strong></span> in the image below) These statuses provide insights into the Wi-Fi connectivity and troubleshooting steps for common issues:</p>
<ul>
<li><strong>Connected</strong>: The printer has successfully connected to the network.</li>
<li><strong>Link down</strong>: The printer is connected to the Wi-Fi access point but hasn't obtained an IP address. This could be due to a weak signal, interference, absence of DHCP server on the network, or similar issues. A short "Down" period might occur as part of the normal connection process, so waiting a bit often resolves this.</li>
<li><strong>No AP</strong>: The printer is not connected to any Wi-Fi access point, possibly due to a weak signal, incorrect credentials, or compatibility issues (e.g., the printer’s ESP Wi-Fi module can only connect to 2.4GHz Wi-Fi, not 5GHz-only access points).</li>
<li><strong>ESP error</strong>: Indicates a communication breakdown between the ESP Wi-Fi module and the printer’s main board, potentially due to an ESP firmware crash or a connection issue. The printer will reboot the ESP module automatically to resolve this. If the error recurs, user intervention may be required, such as replugging or reflashing the ESP.</li>
<li><strong>Gone</strong>: The ESP module is either unplugged or does not have an appropriate firmware installed.</li>
<li><strong>Flash ESP</strong>: The connected ESP module has outdated or incorrect firmware and needs updating / reflashing.<br />Select "Setup Wi-Fi Module" item in the same menu. The printer will automatically re-flash the ESP module firmware as a part of the setup wizard.</li>
</ul>
<h4> </h4>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/02/555e58e4f3b6522b94ec5fdfcc969165_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="PrusaLink Troubleshooting - Review" alt="MK4 / XL Wi-Fi connection status" width="600" height="450" loading="lazy" /></p>
<h4>The browser login does not work</h4>
<p>Attempt the login using another browser, some browsers might have issues with the PrusaLink login. </p>
<h4>The printer does not establish a connection (8+ minutes)</h4>
<p>Double-check the credentials in the prusa_printer_settings.ini file, and load them again in the USB drive. In each field, ensure that there is no space before and after the = character. Having the following special characters as part of the SSID would also cause the connection to not be established, make sure they are not part of the SSID: </p>
<ul>
<li>- (Dash)</li>
<li>_ (Underscore)</li>
<li>' (Apostrophe)</li>
<li>. (Dot)</li>
</ul>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/782027dd534617cf_painted.png" alt="" width="500" height="375" loading="lazy" /></p>
<p> </p>
<p>On the <strong>MINI/+</strong> with firmware version up to 4.4x, the prusa_printer_settings.ini file might show an extra row, ensure that this is not changed (key_mgmt=WPA)</p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2022/05/646e334be3da2dd0_painted.jpeg" alt="" width="500" height="375" loading="lazy" /></p>
<p> </p>
<h3>Original Prusa i3 MK3/S/+, MK2.5/S</h3>
<h4>Bad X-Api-Key</h4>
<p>If <strong>PrusaLink </strong>is selected in PrusaSlicer, it is necessary to enter an <strong>API key</strong>. For PrusaLink 0.7.0 or higher, the API key can be found in Prusa Connect, in the Settings tab, on older versions it is shown during the PrusaLink Wizard. Alternatively, select <strong>HTTP digest</strong> for authentication and add your PrusaLink username and password.</p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/07/be235d272b70fcd5d86012f40daf4598.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="PrusaLink Troubleshooting" alt="" width="600" height="490" loading="lazy" /></p>
<h4>500 internal server error</h4>
<p>This error is caused by the printer serial number not being written properly on the printer Einsy board EEPROM. The solution is copying the serial number to the Einsy EEPROM, with the following procedure: </p>
<ol>
<li>Connect a power bank, a USB charger, or another source of power (excluding a computer) to the printer USB type B port.</li>
<li>With the printer switched on, press the reset button. </li>
</ol>
<h4>Some options in printer detail are not available</h4>
<ul>
<li>Make sure the printer is online and ready</li>
<li>If you do not see any options at all, make sure you have the correct version 0.6.1 of the PrusaLink SD card image flashed to your RPi. In case of doubt, <a href="http://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744#222170">download the PrusaLink SD card image again</a>.</li>
</ul>
<h4>“ERR: NO IP” on LCD</h4>
<ul>
<li>Wait for up to 5 minutes, sometimes it shows the IP later.</li>
<li>Make sure you have Wi-Fi within reach and in 2.4 GHz.
<div class="note-callout">5GHz Wi-Fi is not supported.</div>
</li>
<li><a href="http://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744#304787">Set up the SD card in Pi Imager again</a>, making sure you have the name and password entered correctly in Pi Imager settings.</li>
</ul>
<h4>The IP address is not shown</h4>
<ul>
<li>Make sure the RPi port option in <em>LCD menu -&gt; Settings -&gt; RPi port</em> is ON. </li>
<li>Check that the green LED is on or flashing at the bottom right corner of the RPi.
<div class="warning-callout">If the green LED is not on or flashing, the RPi is not working. Review the soldering of the pins, and make sure the pins are long enough. You can test the Pi by connecting it to USB power, but make sure it is not connected via pins to the Einsy board in that case!</div>
</li>
<li>Check that the SD card can be accessed on your computer. Try a different computer if possible, or <a href="http://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744#304787">set up the SD card in Pi Imager again</a>.</li>
</ul>
<h4>Credentials cannot be saved on RPi Imager</h4>
<p>Ensure that the network has a password. A network without a password cannot be saved on the RPi Imager.</p>
<h4>White/blank screen after finishing the Wizard</h4>
<p>Make sure you are logged in on <a href="https://connect.prusa3d.com/" target="_blank" rel="noopener">connect.prusa3d.com</a>.</p>
<h4>Forgotten login/password to the Link’s website or printer accidentally removed from Connect</h4>
<p>It will be necessary to go through the wizard again. Remove the prusa_printer_settings.ini file from the folder /home/pi, and <a href="http://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744#304787">set up the SD card in Pi Imager again</a>.</p>
<h4>Flashing takes a long amount of time (20+ minutes)</h4>
<ul>
<li>Make sure you are using a Class10 micro SD card or better. Slow microSD cards affect the speed of the flashing.</li>
<li>Some computers, especially old ones, may have a slow SD card reader. Try the USB reader, if available.</li>
</ul>
<h4>The wizard is slow (2+ minutes to load the next page)</h4>
<ul>
<li>PrusaLink might be still loading. Wait for a few minutes and try again.</li>
<li>Make sure your computer and your printer are connected to the very same network. For example, if your computer is connected by cable and your printer is connected via WiFi, it can cause this issue.</li>
</ul>
<h4>The LCD shows “Starting PrusaLink” after 5+ minutes (MK3/S/+)</h4>
<ul>
<li>Make sure you are using the latest <a href="https://help.prusa3d.com/downloads" target="_blank" rel="noopener">firmware version</a>.</li>
<li><a href="http://help.prusa3d.com/guide/prusalink-and-prusa-connect-setup-mk3-s-_221744#304787">Set up the SD card in Pi Imager again</a>.</li>
</ul>
<h4>Slow uploading of the G-code to PrusaLink</h4>
<p>The upload speed is limited while printing to prevent slowing down the print.</p>
<h4>The Wizard can’t get the serial number from the printer (Err obtaining SN)</h4>
<p>Make sure you are using the latest <a href="https://help.prusa3d.com/downloads">firmware version</a>. </p>
<div class="tip-callout">Contact our <a href="http://help.prusa3d.com/article/customer-support_2287">Customer Support</a> if the previous step is not solving the issue. </div>
<h4>Error bad token</h4>
<div>This may occur if you use PrusaLink on a different printer than the one it was set up with. In this case, make a fresh PrusaLink installation.</div>
<h4>Err unsupported FW</h4>
<p>Upgrade the printer to the latest firmware.</p>


PrusaLink Troubleshooting

<p>If the filament is not loaded into the extruder, yet the printer is trying to pull the filament inside, there might be a hardware problem in some of the extruder components: we will examine the causes and fixes in this article. </p>
<h3>Filament tip</h3>
<p>Ensure that the filament tip is cut at an approximate 45 degrees angle. The printer might struggle to load filament otherwise. </p>
<h3>Retry procedure</h3>
<p>After an attempt at loading filament, the printer will prompt a screen, where it is asked if the filament color is correct. If the filament is not oozing from the nozzle at this stage, push the filament towards the extruder, and after that, select "retry". </p>
<h3>Idler tension screws</h3>
<p>The extruder includes two idler tension screws, to set the correct distance between the drive gear and the two driven gears. These are set to the optimal position at the factory. In case of an intervention on that component, it will be necessary to adjust the idler tension screws to their optimal position: the tips of the screws must be aligned with the front surface of the Idler Nut. After that, close the Idler Block.</p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/XL_Extruder_Open2.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Filament not loading (FIONA)" alt="" width="600" height="450" loading="lazy" /></p>
<h3>Clogged hotend</h3>
<p>Follow the instructions on the dedicated article on <a href="http://help.prusa3d.com/article/clogged-hotend-mk4_411823">how to spot and fix a clogged hotend</a>. </p>
<div class="tip-callout">Are you still having issues? Contact our <a href="http://help.prusa3d.com/article/customer-support_2287">support team</a> and let them know that you tried to fix the issue with these instructions. We will take it from there.</div>


Filament not loading (MK4/S, MK3.9/S)

<p>During normal function, your printer saves statistics, calibration data, and personalized settings, even after it is turned off. If you feel like you changed settings that have negatively affected your 3D printer, you can always revert to factory default values and try again. </p>
<div class="note-callout">Doing a factory reset will clear statistics data, like total printing time and filament use.</div>
<h3>How to factory reset</h3>
<p>Factory Reset can be done via <em>LCD Menu -&gt; Settings -&gt; System -&gt; Factory Reset</em>. </p>
<p>Starting firmware 4.6.1 there are two options:</p>
<ul>
<li><strong>Reset Settings &amp; Calibrations</strong> - this option deletes all changes done by the user and reverts the system to its original state. For most of the cases, this is a sufficient method. Technically speaking only the EEPROM with user stored data is deleted. Once, the reset is done, the printer will boot to language selection, followed by the calibration wizard.</li>
<li><strong>Hard reset (USB with FW needed)</strong> - due to the complex partition layout, the firmware stores its settings not only in the EEPROM but also on the XFLASH. In some edge cases, it might be necessary to delete both of these. Once this reset is done, the user must insert a USB drive with <a href="http://help.prusa3d.com/article/how-to-update-firmware-core-one-mk4-s-mk3-9-s-mk3-5-s-xl_453086">firmware</a> as some parts of the XFLASH will be created again from scratch.</li>
</ul>
<h3>Flashing firmware</h3>
<p>If you see any inconsistent behavior we recommend also flashing the firmware.</p>
<ul>
<li><a href="http://help.prusa3d.com/article/how-to-update-firmware-core-one-mk4-s-mk3-9-s-mk3-5-s-xl_453086">CORE One, MK4/S, MK3.9/S, MK3.5/S, XL</a></li>
<li><a href="http://help.prusa3d.com/article/firmware-updating-mini-mini_124784">MINI/+</a></li>
</ul>
<p>A factory reset followed by flashing the firmware and recalibrating will resolve most firmware issues you may encounter. </p>


Factory reset (CORE One, MK4/S, MK3.9/S, MK3.5/S, MINI/+, XL)

<p>The Original Prusa MK4/S and MK3.9/S are equipped with a 24V xBuddy mainboard. This 32-bit logic board has three removable automotive fuses protecting the crucial components. If your printer or some of its components suddenly stopped working, it is recommended to check these fuses and replace them if necessary.</p>
<h4>Each fuse protects a different part of the board:</h4>
<ul>
<li><span style="color: #0a0aef;"><strong>F1 (10A fuse)</strong></span>: Heatbed heating</li>
<li><em><strong><span style="color: #e03e2d;">F2 (5A fuse)</span></strong>: </em>Motors + logic unit + fans</li>
<li><em><span style="color: #2dc26b;"><strong>F3 (5A fuse)</strong></span>: </em>Extruder heater</li>
</ul>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/ad5f9482fba44373_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Blown Fuse (FIONA)" alt="" width="600" /></p>
<h3>Checking the fuses</h3>
<p>Before checking the fuses, turn the printer off and disconnect the power cord.</p>
<p>Open the xBuddyBox-cover and the el-box-cover by opening the screws indicated below. Then pull out the fuses and inspect them.</p>
<table style="border-collapse: collapse; width: 100%;" border="0">
<tbody>
<tr>
<td style="width: 50.0613%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/ef0adcc4ba6782d2_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Blown Fuse (FIONA)" alt="" width="400" height="267" loading="lazy" /></td>
<td style="width: 50.0613%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/783109cb80ab5ceb_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Blown Fuse (FIONA)" alt="" width="400" height="267" loading="lazy" /></td>
</tr>
</tbody>
</table>
<div> </div>
<div><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/11d9eb7b0a1efeda.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Blown Fuse (MK4)" alt="" width="420" height="420" loading="lazy" /></div>
<div class="note-callout">If you own a multimeter, you can check the components for a potential short. <a href="http://help.prusa3d.com/article/multimeter-usage_2117">Multimeter usage</a> will show you how.</div>
<h3>PSU fuse</h3>
<p>The MK4 PSU uses an <strong>F8AH250V 20mm fuse (fast)</strong>. You can check the pictures below for how to find the fuse in your PSU.</p>
<p>When you are replacing the fuse, make sure that the printer is turned off and disconnected from the power source.</p>
<ul>
<li><strong>Find the PSU fuse</strong>, which is located just above the PSU's power plug.</li>
<li><strong>Remove the cover of the PSU fuse</strong>, the best tool for that is the screwdriver that comes bundled with our printer.</li>
<li><strong>Inspect if the wire inside of the fuse is intact</strong>. If it is damaged, then it must be replaced.</li>
</ul>
<table style="border-collapse: collapse; width: 100%;" border="0">
<tbody>
<tr>
<td style="width: 48.8358%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/af529529b3804e2c.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Blown Fuse (FIONA)" alt="" width="400" height="300" loading="lazy" /></td>
<td style="width: 48.8358%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/03/deltapsu.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Blown Fuse (FIONA)" alt="" width="400" height="300" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h3>Replacing blown fuses</h3>
<p>If you find out that any of the fuses are blown, you can easily replace them. The fuses can be found at any local car parts/hardware store or ordered online. It's a good practice to bring the blown fuse with you so that you can get the exact same one.</p>
<ol>
<li><strong>Turn the printer off, disconnect the power, </strong>and remove the blown fuse(s) from their sockets.</li>
<li>Place the new fuse in the correct slot - <strong>Double-check that you are replacing 5A for 5A or 15A for 15A if changing it on the xBuddy</strong>.</li>
<li><strong>Unplug any components</strong> connected to the previously blown fuse and try to turn on your printer. Check for any kind of unwanted behavior.</li>
<li>Once again, turn off the printer and remove the power cord. Then <strong>reconnect all the disconnected components</strong>.</li>
</ol>


Blown Fuse (MK4/S, MK3.9/S)

<h3>What happened?</h3>
<p>The <strong>Prusa CORE One</strong>, and the <strong>Original Prusa MK4/S</strong>, <strong>MK3.9/S</strong> are equipped with a <strong>loadcell</strong>, which detects whether the nozzle is close enough to the steel sheet for printing and prevents damage from the nozzle digging into the steel sheet. </p>
<p>The printer firmware expects a measurement sample from the loadcell to occur within a specified time. In case this does not happen, the printer will show the message <strong>"There was a timeout while waiting for measurement sample, please repeat the action."</strong></p>
<p>Error name: Loadcell Timeout</p>
<p>Error code: #31528 (CORE One) #26528 (MK4S) #13528 (MK4) #27528 (MK3.9S) #21528 (MK3.9)</p>
<h3>How to fix it? </h3>
<h4>A visual inspection</h4>
<div class="warning-callout">Before you start, make sure:</p>
<ul>
<li>the filament is unloaded from the extruder</li>
<li>the printer is turned OFF and unplugged from electricity</li>
<li>the hotend and the heatbed are cooled down to ambient temperature</li>
</ul>
</div>
<p>Access the right side of the LoveBoard, where the loadcell cable is connected. To remove the side LoveBoard cover, on CORE One loosen two<span style="color: #000000;"> <span style="color: #236fa1;"><strong>M3x6 bolts</strong></span></span>, on MK4/S and MK3.9/S loosen one <span style="color: #843fa1;"><strong>M3x10 bolt</strong></span>. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/c565b5d3a12f4e32b712cc273759d4e8_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Timeout REVIEW #31528 (CORE One) #26528 (MK4S) #13528 (MK4) #27528 (MK3.9S) #21528 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/94e576c7396585eb388df6fd136a8ec8_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<p>Once accessed, locate the <span style="color: #e67e23;"><strong>loadcell connector</strong></span> and cable, and check for any loose cable, disconnected cable, or visible damage. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;">
<p style="text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/04/98f9151af765084ab2be69a52d63f20c_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></p>
</td>
<td style="width: 48.8562%; text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/3c492d1b5efc9c403a26bd3c455c2ea7_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h4><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/5e54e7bdd6fef88f48746c4095106a4f.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="500" height="375" loading="lazy" /></h4>
<h4>Re-test the loadcell</h4>
<div class="warning-callout">Do not manipulate or touch the printer unless the instructions on the printer screen prompt you to do so.</div>
<div>
<p>Navigate to <em>LCD Menu -&gt; Control -&gt; Calibrations &amp; Tests -&gt; Loadcell Test</em> to initiate a loadcell test. </p>
<p>During the test, you will be asked to tap the nozzle at a specific time, and a progress bar shown on the screen is filled, depending on the pressure applied to the loadcell. If the bar is not filled or is filled irregularly, please contact our <a href="http://help.prusa3d.com/article/customer-support_2287">customer support</a>. </p>
<div class="tip-callout">Tapping of the nozzle can be done with a finger, as well as with a hard object. </div>
<table style="border-collapse: collapse; width: 100%; border-style: none;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/e03a4297a772916ed43b160f9300a4b6_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/3226ee7326e5f8c4057eb46f4d9f8a55_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h3>Loadcell white pad - visual check </h3>
<div class="warning-callout">Ensure to have the <strong>PG-assembly-adapter</strong> before continuing with the following procedure. If you do not have it, you can print it using the below files, depending on the printer you will use: <br /><a href="https://files.printables.com/media/prints/451501/stls/4104840_55cb7d05-d1f6-4cca-8159-db9ac9f62942/pg-assembly-adapter-mk4-r1.stl">PG-assembly-adapter printed with MK4/S</a><br /><a href="https://files.printables.com/media/prints/451501/stls/4240522_6fa05937-693e-4282-8dce-a98d3e93fd5f/pg-assembly-adapter-mk3-r2.stl">PG-assembly-adapter printed with MK3/S/+</a></div>
<ol>
<li>If any filament is loaded, unload the filament, then wait for the printer to fully cool down. After that, turn the printer off.</li>
<li>Remove the PG-case, together with the PG-ring, gearbox, and main plate. Remove all of these parts in one piece. </li>
</ol>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/1c7df54642bb103d2a7d3ed01b41cbff_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/67c593556671a61a79c52036477d3454.jpg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="3">
<li>The top part of the loadcell is now visible and has a white pad attached to it. Without touching the white pad, check it for damage. </li>
</ol>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/4f0b8b4b2de761bec7c838efa8152ca9_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="500" height="375" loading="lazy" /></p>
<ol start="4">
<li>Reassemble the block of PG-case, PG-ring, gearbox, and main plate. In case the parts are not in one block, follow the dedicated steps from the Nextruder <a href="http://help.prusa3d.com/attachment/ltlznibfugnpwtwy-jpg_272">assembly manual</a>, depending on your printer version. </li>
<li>Perform the <a href="http://help.prusa3d.com/article/gearbox-alignment-core-one-mk4-s-mk3-9-s_465779">gearbox alignment</a>. </li>
</ol>
</div>


Loadcell Timeout #31528 (CORE One) #26528 (MK4S) #13528 (MK4) #27528 (MK3.9S) #21528 (MK3.9)

<h3>What happened?</h3>
<p>The <strong>Prusa CORE One</strong>, and the <strong>Original Prusa MK4/S</strong>, <strong>MK3.9/S</strong> are equipped with a <strong>loadcell</strong>, which detects whether the nozzle is close enough to the steel sheet for printing and prevents damage from the nozzle digging into the steel sheet. </p>
<p>The loadcell measures the amount of force that the nozzle applies to the steel sheet. In case the measured value is abnormally high, or undefined, the printer will show the message <strong>"Loadcell measured an infinite or undefined load value."</strong></p>
<p>Error name: Loadcell Measure Failed</p>
<p>Error code: #31526 (CORE One) #26526 (MK4S) #13526 (MK4) #27526 (MK3.9S) #21526 (MK3.9)</p>
<h3>How to fix it? </h3>
<h4>A visual inspection</h4>
<div class="warning-callout">Before you start, make sure:</p>
<ul>
<li>the filament is unloaded from the extruder</li>
<li>the printer is turned OFF and unplugged from electricity</li>
<li>the hotend and the heatbed are cooled down to ambient temperature</li>
</ul>
</div>
<p>Access the right side of the LoveBoard, where the loadcell cable is connected. To remove the side LoveBoard cover, on CORE One loosen two<span style="color: #000000;"> <span style="color: #236fa1;"><strong>M3x6 bolts</strong></span></span>, on MK4/S and MK3.9/S loosen one <span style="color: #843fa1;"><strong>M3x10 bolt</strong></span>. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/c565b5d3a12f4e32b712cc273759d4e8_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Measure Failed REVIEW #31526 (CORE One) #26526 (MK4S) #13526 (MK4) #27526 (MK3.9S) #21526 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/94e576c7396585eb388df6fd136a8ec8_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<p>Once accessed, locate the <span style="color: #e67e23;"><strong>loadcell connector</strong></span> and cable, and check for any loose cable, disconnected cable, or visible damage. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;">
<p style="text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/04/98f9151af765084ab2be69a52d63f20c_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></p>
</td>
<td style="width: 48.8562%; text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/3c492d1b5efc9c403a26bd3c455c2ea7_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h4><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/5e54e7bdd6fef88f48746c4095106a4f.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="500" height="375" loading="lazy" /></h4>
<h4>Re-test the loadcell</h4>
<div class="warning-callout">Do not manipulate or touch the printer unless the instructions on the printer screen prompt you to do so.</div>
<div>
<p>Navigate to <em>LCD Menu -&gt; Control -&gt; Calibrations &amp; Tests -&gt; Loadcell Test</em> to initiate a loadcell test. </p>
<p>During the test, you will be asked to tap the nozzle at a specific time, and a progress bar shown on the screen is filled, depending on the pressure applied to the loadcell. If the bar is not filled or is filled irregularly, please contact our <a href="http://help.prusa3d.com/article/customer-support_2287">customer support</a>. </p>
<div class="tip-callout">Tapping of the nozzle can be done with a finger, as well as with a hard object. </div>
<table style="border-collapse: collapse; width: 100%; border-style: none;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/e03a4297a772916ed43b160f9300a4b6_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/3226ee7326e5f8c4057eb46f4d9f8a55_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h3>Loadcell white pad - visual check </h3>
<div class="warning-callout">Ensure to have the <strong>PG-assembly-adapter</strong> before continuing with the following procedure. If you do not have it, you can print it using the below files, depending on the printer you will use: <br /><a href="https://files.printables.com/media/prints/451501/stls/4104840_55cb7d05-d1f6-4cca-8159-db9ac9f62942/pg-assembly-adapter-mk4-r1.stl">PG-assembly-adapter printed with MK4/S</a><br /><a href="https://files.printables.com/media/prints/451501/stls/4240522_6fa05937-693e-4282-8dce-a98d3e93fd5f/pg-assembly-adapter-mk3-r2.stl">PG-assembly-adapter printed with MK3/S/+</a></div>
<ol>
<li>If any filament is loaded, unload the filament, then wait for the printer to fully cool down. After that, turn the printer off.</li>
<li>Remove the PG-case, together with the PG-ring, gearbox, and main plate. Remove all of these parts in one piece. </li>
</ol>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/1c7df54642bb103d2a7d3ed01b41cbff_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/67c593556671a61a79c52036477d3454.jpg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="3">
<li>The top part of the loadcell is now visible and has a white pad attached to it. Without touching the white pad, check it for damage. </li>
</ol>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/4f0b8b4b2de761bec7c838efa8152ca9_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="500" height="375" loading="lazy" /></p>
<ol start="4">
<li>Reassemble the block of PG-case, PG-ring, gearbox, and main plate. In case the parts are not in one block, follow the dedicated steps from the Nextruder <a href="http://help.prusa3d.com/attachment/ltlznibfugnpwtwy-jpg_272">assembly manual</a>, depending on your printer version. </li>
<li>Perform the <a href="http://help.prusa3d.com/article/gearbox-alignment-core-one-mk4-s-mk3-9-s_465779">gearbox alignment</a>. </li>
</ol>
</div>


Loadcell Measure Failed #31526 (CORE One) #26526 (MK4S) #13526 (MK4) #27526 (MK3.9S) #21526 (MK3.9)

<h3>What happened?</h3>
<p>The <strong>Prusa CORE One</strong>, and the <strong>Original Prusa MK4/S</strong>, <strong>MK3.9/S</strong> are equipped with a <strong>loadcell</strong>, which detects whether the nozzle is close enough to the steel sheet for printing and prevents damage from the nozzle digging into the steel sheet. </p>
<p>During a selftest, the loadcell is tested. The loadcell can also be tested at any time through the printer menu. If the loadcell calibration is not done, or the printer does not recognize that it has been done, it will show the message: <strong>"Loadcell calibration is not finished. Finish the calibration first."</strong></p>
<p>Error name: Loadcell Not Calibrated</p>
<p>Error code: #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)</p>
<h3>How to fix it? </h3>
<h4>A visual inspection</h4>
<div class="warning-callout">Before you start, make sure:</p>
<ul>
<li>the filament is unloaded from the extruder</li>
<li>the printer is turned OFF and unplugged from electricity</li>
<li>the hotend and the heatbed are cooled down to ambient temperature</li>
</ul>
</div>
<p>Access the right side of the LoveBoard, where the loadcell cable is connected. To remove the side LoveBoard cover, on CORE One loosen two<span style="color: #000000;"> <span style="color: #236fa1;"><strong>M3x6 bolts</strong></span></span>, on MK4/S and MK3.9/S loosen one <span style="color: #843fa1;"><strong>M3x10 bolt</strong></span>. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/c565b5d3a12f4e32b712cc273759d4e8_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/94e576c7396585eb388df6fd136a8ec8_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<p>Once accessed, locate the <span style="color: #e67e23;"><strong>loadcell connector</strong></span> and cable, and check for any loose cable, disconnected cable, or visible damage. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;">
<p style="text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/04/98f9151af765084ab2be69a52d63f20c_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></p>
</td>
<td style="width: 48.8562%; text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/3c492d1b5efc9c403a26bd3c455c2ea7_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h4><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/5e54e7bdd6fef88f48746c4095106a4f.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="500" height="375" loading="lazy" /></h4>
<h4>Re-test the loadcell</h4>
<div class="warning-callout">Do not manipulate or touch the printer unless the instructions on the printer screen prompt you to do so.</div>
<div>
<p>Navigate to <em>LCD Menu -&gt; Control -&gt; Calibrations &amp; Tests -&gt; Loadcell Test</em> to initiate a loadcell test. </p>
<p>During the test, you will be asked to tap the nozzle at a specific time, and a progress bar shown on the screen is filled, depending on the pressure applied to the loadcell. If the bar is not filled or is filled irregularly, please contact our <a href="http://help.prusa3d.com/article/customer-support_2287">customer support</a>. </p>
<div class="tip-callout">Tapping of the nozzle can be done with a finger, as well as with a hard object. </div>
<table style="border-collapse: collapse; width: 100%; border-style: none;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/e03a4297a772916ed43b160f9300a4b6_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/3226ee7326e5f8c4057eb46f4d9f8a55_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h3>Loadcell white pad - visual check </h3>
<div class="warning-callout">Ensure to have the <strong>PG-assembly-adapter</strong> before continuing with the following procedure. If you do not have it, you can print it using the below files, depending on the printer you will use: <br /><a href="https://files.printables.com/media/prints/451501/stls/4104840_55cb7d05-d1f6-4cca-8159-db9ac9f62942/pg-assembly-adapter-mk4-r1.stl">PG-assembly-adapter printed with MK4/S</a><br /><a href="https://files.printables.com/media/prints/451501/stls/4240522_6fa05937-693e-4282-8dce-a98d3e93fd5f/pg-assembly-adapter-mk3-r2.stl">PG-assembly-adapter printed with MK3/S/+</a></div>
<ol>
<li>If any filament is loaded, unload the filament, then wait for the printer to fully cool down. After that, turn the printer off.</li>
<li>Remove the PG-case, together with the PG-ring, gearbox, and main plate. Remove all of these parts in one piece. </li>
</ol>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/1c7df54642bb103d2a7d3ed01b41cbff_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/67c593556671a61a79c52036477d3454.jpg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="3">
<li>The top part of the loadcell is now visible and has a white pad attached to it. Without touching the white pad, check it for damage. </li>
</ol>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/4f0b8b4b2de761bec7c838efa8152ca9_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="500" height="375" loading="lazy" /></p>
<ol start="4">
<li>Reassemble the block of PG-case, PG-ring, gearbox, and main plate. In case the parts are not in one block, follow the dedicated steps from the Nextruder <a href="http://help.prusa3d.com/attachment/ltlznibfugnpwtwy-jpg_272">assembly manual</a>, depending on your printer version. </li>
<li>Perform the <a href="http://help.prusa3d.com/article/gearbox-alignment-core-one-mk4-s-mk3-9-s_465779">gearbox alignment</a>. </li>
</ol>
</div>


Loadcell Not Calibrated #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)

<h3>What happened?</h3>
<p>The <strong>Prusa CORE One</strong>, and the <strong>Original Prusa MK4/S</strong>, <strong>MK3.9/S</strong> are equipped with a <strong>loadcell</strong>, which detects whether the nozzle is close enough to the steel sheet for printing and prevents damage from the nozzle digging into the steel sheet. </p>
<p>In case the printer detects an incorrect loadcell configuration, but not related to the loadcell tare, or to the loadcell calibration, the printer will show the message: <strong>"The loadcell configuration is incorrect."</strong></p>
<p>Error name: Loadcell Bad Configuration</p>
<p>Error code: #31527 (CORE One) #26527 (MK4S) #13527 (MK4) #27527 (MK3.9S) #21527 (MK3.9)</p>
<h3>How to fix it? </h3>
<h4>A visual inspection</h4>
<div class="warning-callout">Before you start, make sure:</p>
<ul>
<li>the filament is unloaded from the extruder</li>
<li>the printer is turned OFF and unplugged from electricity</li>
<li>the hotend and the heatbed are cooled down to ambient temperature</li>
</ul>
</div>
<p>Access the right side of the LoveBoard, where the loadcell cable is connected. To remove the side LoveBoard cover, on CORE One loosen two<span style="color: #000000;"> <span style="color: #236fa1;"><strong>M3x6 bolts</strong></span></span>, on MK4/S and MK3.9/S loosen one <span style="color: #843fa1;"><strong>M3x10 bolt</strong></span>. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/c565b5d3a12f4e32b712cc273759d4e8_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Bad Configuration REVIEW #31527 (CORE One) #26527 (MK4S) #13527 (MK4) #27527 (MK3.9S) #21527 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/94e576c7396585eb388df6fd136a8ec8_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<p>Once accessed, locate the <span style="color: #e67e23;"><strong>loadcell connector</strong></span> and cable, and check for any loose cable, disconnected cable, or visible damage. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;">
<p style="text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/04/98f9151af765084ab2be69a52d63f20c_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></p>
</td>
<td style="width: 48.8562%; text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/3c492d1b5efc9c403a26bd3c455c2ea7_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h4><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/5e54e7bdd6fef88f48746c4095106a4f.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="500" height="375" loading="lazy" /></h4>
<h4>Re-test the loadcell</h4>
<div class="warning-callout">Do not manipulate or touch the printer unless the instructions on the printer screen prompt you to do so.</div>
<div>
<p>Navigate to <em>LCD Menu -&gt; Control -&gt; Calibrations &amp; Tests -&gt; Loadcell Test</em> to initiate a loadcell test. </p>
<p>During the test, you will be asked to tap the nozzle at a specific time, and a progress bar shown on the screen is filled, depending on the pressure applied to the loadcell. If the bar is not filled or is filled irregularly, please contact our <a href="http://help.prusa3d.com/article/customer-support_2287">customer support</a>. </p>
<div class="tip-callout">Tapping of the nozzle can be done with a finger, as well as with a hard object. </div>
<table style="border-collapse: collapse; width: 100%; border-style: none;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/e03a4297a772916ed43b160f9300a4b6_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/3226ee7326e5f8c4057eb46f4d9f8a55_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h3>Loadcell white pad - visual check </h3>
<div class="warning-callout">Ensure to have the <strong>PG-assembly-adapter</strong> before continuing with the following procedure. If you do not have it, you can print it using the below files, depending on the printer you will use: <br /><a href="https://files.printables.com/media/prints/451501/stls/4104840_55cb7d05-d1f6-4cca-8159-db9ac9f62942/pg-assembly-adapter-mk4-r1.stl">PG-assembly-adapter printed with MK4/S</a><br /><a href="https://files.printables.com/media/prints/451501/stls/4240522_6fa05937-693e-4282-8dce-a98d3e93fd5f/pg-assembly-adapter-mk3-r2.stl">PG-assembly-adapter printed with MK3/S/+</a></div>
<ol>
<li>If any filament is loaded, unload the filament, then wait for the printer to fully cool down. After that, turn the printer off.</li>
<li>Remove the PG-case, together with the PG-ring, gearbox, and main plate. Remove all of these parts in one piece. </li>
</ol>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/1c7df54642bb103d2a7d3ed01b41cbff_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/67c593556671a61a79c52036477d3454.jpg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="3">
<li>The top part of the loadcell is now visible and has a white pad attached to it. Without touching the white pad, check it for damage. </li>
</ol>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/4f0b8b4b2de761bec7c838efa8152ca9_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="500" height="375" loading="lazy" /></p>
<ol start="4">
<li>Reassemble the block of PG-case, PG-ring, gearbox, and main plate. In case the parts are not in one block, follow the dedicated steps from the Nextruder <a href="http://help.prusa3d.com/attachment/ltlznibfugnpwtwy-jpg_272">assembly manual</a>, depending on your printer version. </li>
<li>Perform the <a href="http://help.prusa3d.com/article/gearbox-alignment-core-one-mk4-s-mk3-9-s_465779">gearbox alignment</a>. </li>
</ol>
</div>


Loadcell Bad Configuration #31527 (CORE One) #26527 (MK4S) #13527 (MK4) #27527 (MK3.9S) #21527 (MK3.9)

<p>A tangled filament spool can cause a print to fail, as a knot can form on the filament strand. This is caused by <span style="color: #236fa1;"><strong>letting the filament end go</strong></span>, for example during a filament unloading, causing the filament end to go under another loop. As a visual example, notice the path of the spool parts indicated with <span style="color: #2dc26b;"><strong>green</strong> </span>and <span style="color: #b96ad9;"><strong>magenta</strong></span> arrows, inside of the <span style="color: #e67e23;"><strong>orange rectangle</strong></span>. </p>
<div class="tip-callout">Although a tangled filament can cause a print to fail, the chances are minimized by <strong>never leaving the printer unattended</strong> while it is switched on, a safety measure valid for our printers, as stated in the bundled 3D Printing Handbook of each of our printers. </div>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/c5697034725522b10cfbd7bb0ade906c_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Tangled filament" alt="" width="500" height="333" loading="lazy" /></p>
<h3>Winding</h3>
<p>The filament in a spool is a single, continuous string wound at once from start to finish. It is physically impossible that, during production, a filament coil can get under another. </p>
<p><strong>Perfect winding</strong> refers to the filament sitting nice and tidy on the spool, with no overlaps. It is our way of making Prusament visually pleasing. </p>
<p>Even though a spool does not have perfect winding, this doesn't have an influence on it being prone to tangling. </p>
<h3>How to prevent tangling</h3>
<p>To prevent filament tangling, do not let go of the filament tip whenever the filament is not loaded. Once you are ready to store the spool, put the filament tip on the spaces on the spool, for example on any of the honeycombs for Prusament spools. </p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/c5c946cfa9fb51c0303cf07e3a30706a_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Tangled filament" alt="" width="500" height="375" loading="lazy" /></p>
<h3>How to untangle </h3>
<div class="note-callout">Never let go of the filament tip during this procedure, or you'd risk further tangling the filament in different spots. </div>
<p>Identify the <span style="color: #ba372a;"><strong>knotted strands</strong></span>, and gently <span style="color: #e67e23;"><strong>untangle the knot</strong></span> from that point, without bending the filament. After that, rewind the loose strands by gently rotating both the spool and the coil. <span style="color: #236fa1;"><strong>Never let go of the filament end</strong></span>, until this is secured on a hole on the side of the spool. </p>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/f9e1328251622bcedae68ce062af94ef_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Tangled filament" alt="" width="500" height="333" loading="lazy" /></p>


Tangled filament

<h3>What happened?</h3>
<p>When trying to install non-official firmware on your Original Prusa MK4/S, MK3.9/S, or MK3.5/S, the screen shows "<strong>Firmware signature verification failed! Only official signed firmware can be flashed</strong>".</p>
<p>Error name: Signature verification failed</p>
<p>Error code: #26606 (MK4S) #13606 (MK4) #27606 (MK3.9S) #21606 (MK3.9) #28606 (MK3.5S) #23606 (MK3.5) </p>
<p>The error is issued when your printer has detected an attempt to flash firmware that does not have the private key signature that verifies the firmware as being official.</p>
<h3>How to fix it?</h3>
<p>The Original Prusa MK4/S, MK3.9/S, and MK3.5/S in their factory state only accept official firmware. In order to flash a custom firmware, you need to break the <strong>appendix seal</strong> on the <strong>xBuddy board</strong>. </p>
<div class="warning-callout">Breaking the <strong>appendix seal won’t void your warranty</strong>, so you are free to flash custom firmware.<br />However, since there is no way for us to verify or test every single custom firmware on the internet, <strong>we disclaim liability for any kind of damage or harm a printer with a broken seal may cause</strong> (e.g. in case of a fire). <br />So, please, don’t mindlessly flash suspicious files! </div>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/9e2b3d5d8e34750731b95fc19df8905d.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Signature verification failed #13606 (MK4) #21606 (MK3.9) #23606 (MK3.5)" alt="" width="500" height="376" loading="lazy" /></p>


Signature verification failed #26606 (MK4S) #13606 (MK4) #27606 (MK3.9S) #21606 (MK3.9) #28606 (MK3.5S) #23606 (MK3.5)

<h3>What happened?</h3>
<p>The <strong>Prusa CORE One</strong>, and the <strong>Original Prusa MK4/S, MK3.9/S</strong> are equipped with a <strong>loadcell</strong>, to detect that the nozzle is close enough to the steel sheet for printing, and to avoid damage that would be caused by the nozzle digging into the steel sheet. </p>
<p>The loadcell sets itself a reference, called <strong>tare</strong>. In case there is an issue right before the start of this procedure, the printer will show the message: <strong>"There was an error requesting the tare for loadcell."</strong></p>
<p>Error name: Loadcell Tare Error</p>
<p>Error code: #31524 (CORE One) #26524 (MK4S) #13524 (MK4) #27524 (MK3.9S) #21524 (MK3.9)</p>
<h3>How to fix it? </h3>
<h4>A visual inspection</h4>
<div class="warning-callout">Before you start, make sure:</p>
<ul>
<li>the filament is unloaded from the extruder</li>
<li>the printer is turned OFF and unplugged from electricity</li>
<li>the hotend and the heatbed are cooled down to ambient temperature</li>
</ul>
</div>
<p>Access the right side of the LoveBoard, where the loadcell cable is connected. To remove the side LoveBoard cover, on CORE One loosen two<span style="color: #000000;"> <span style="color: #236fa1;"><strong>M3x6 bolts</strong></span></span>, on MK4/S and MK3.9/S loosen one <span style="color: #843fa1;"><strong>M3x10 bolt</strong></span>. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/c565b5d3a12f4e32b712cc273759d4e8_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Tare Error REVIEW #31524 (CORE One) #26524 (MK4S) #13524 (MK4) #27524 (MK3.9S) #21524 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/94e576c7396585eb388df6fd136a8ec8_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<p>Once accessed, locate the <span style="color: #e67e23;"><strong>loadcell connector</strong></span> and cable, and check for any loose cable, disconnected cable, or visible damage. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;">
<p style="text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/04/98f9151af765084ab2be69a52d63f20c_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></p>
</td>
<td style="width: 48.8562%; text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/3c492d1b5efc9c403a26bd3c455c2ea7_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h4><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/5e54e7bdd6fef88f48746c4095106a4f.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="500" height="375" loading="lazy" /></h4>
<h4>Re-test the loadcell</h4>
<div class="warning-callout">Do not manipulate or touch the printer unless the instructions on the printer screen prompt you to do so.</div>
<div>
<p>Navigate to <em>LCD Menu -&gt; Control -&gt; Calibrations &amp; Tests -&gt; Loadcell Test</em> to initiate a loadcell test. </p>
<p>During the test, you will be asked to tap the nozzle at a specific time, and a progress bar shown on the screen is filled, depending on the pressure applied to the loadcell. If the bar is not filled or is filled irregularly, please contact our <a href="http://help.prusa3d.com/article/customer-support_2287">customer support</a>. </p>
<div class="tip-callout">Tapping of the nozzle can be done with a finger, as well as with a hard object. </div>
<table style="border-collapse: collapse; width: 100%; border-style: none;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/e03a4297a772916ed43b160f9300a4b6_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/3226ee7326e5f8c4057eb46f4d9f8a55_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h3>Loadcell white pad - visual check </h3>
<div class="warning-callout">Ensure to have the <strong>PG-assembly-adapter</strong> before continuing with the following procedure. If you do not have it, you can print it using the below files, depending on the printer you will use: <br /><a href="https://files.printables.com/media/prints/451501/stls/4104840_55cb7d05-d1f6-4cca-8159-db9ac9f62942/pg-assembly-adapter-mk4-r1.stl">PG-assembly-adapter printed with MK4/S</a><br /><a href="https://files.printables.com/media/prints/451501/stls/4240522_6fa05937-693e-4282-8dce-a98d3e93fd5f/pg-assembly-adapter-mk3-r2.stl">PG-assembly-adapter printed with MK3/S/+</a></div>
<ol>
<li>If any filament is loaded, unload the filament, then wait for the printer to fully cool down. After that, turn the printer off.</li>
<li>Remove the PG-case, together with the PG-ring, gearbox, and main plate. Remove all of these parts in one piece. </li>
</ol>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/1c7df54642bb103d2a7d3ed01b41cbff_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/67c593556671a61a79c52036477d3454.jpg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="3">
<li>The top part of the loadcell is now visible and has a white pad attached to it. Without touching the white pad, check it for damage. </li>
</ol>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/4f0b8b4b2de761bec7c838efa8152ca9_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="500" height="375" loading="lazy" /></p>
<ol start="4">
<li>Reassemble the block of PG-case, PG-ring, gearbox, and main plate. In case the parts are not in one block, follow the dedicated steps from the Nextruder <a href="http://help.prusa3d.com/attachment/ltlznibfugnpwtwy-jpg_272">assembly manual</a>, depending on your printer version. </li>
<li>Perform the <a href="http://help.prusa3d.com/article/gearbox-alignment-core-one-mk4-s-mk3-9-s_465779">gearbox alignment</a>. </li>
</ol>
</div>


Loadcell Tare Error #31524 (CORE One) #26524 (MK4S) #13524 (MK4) #27524 (MK3.9S) #21524 (MK3.9)

<p>Some processes in your Original Prusa Printer might generate a rare outcome, not included on our QR code errors or warning screens, and thus give you an error with a blue screen and some code on it. This is commonly known as <strong>BSOD</strong> (Blue Screen of Death). See below the most common fixes, and what to do if they do not help.</p>
<h3>MMU3</h3>
<p>The BSOD might appear after you install your MMU3, or try to flash its firmware. If this happens, switch the printer off, and disconnect the MMU cable(s) from the printer's main board. Check the <a href="http://help.prusa3d.com/article/xbuddy-and-loveboard-electronics-wiring-mk4-s-mk3-9-s_413095">xBuddy board</a> and the MMU board for visible damage. </p>
<div class="warning-callout">Do not disconnect or reconnect any cables while the printer is switched on. </div>
<p>Then, perform a factory reset on the printer. If the option is present, choose Hard Reset.</p>
<ul>
<li><a href="http://help.prusa3d.com/article/factory-reset-mini_177516">MINI/+</a></li>
<li><a href="http://help.prusa3d.com/article/factory-reset-core-one-mk4-s-mk3-9-s-mk3-5-s-mini-xl_421206">MK3.5, MK3.9, MK4, XL</a></li>
</ul>
<p>After the reset, the printer will go through Selftest. When it is finished, install the MMU again.</p>
<h3>Sending files to the printer (USB Drive/Connect)</h3>
<p>If the BSOD appears after trying to select a file from the USB, try using another USB drive, or <a href="http://help.prusa3d.com/article/sd-cards-and-usb-drives_112291#how-do-i-format-the-usb-drive-sd-card">format your drive to FAT32</a>.</p>
<p>If the issue happens when sending a file from Connect, it should be a momentary issue that will go away on its own. If the issue persists, try performing a Factory reset.</p>
<h3>Technical Support and Crash Dump</h3>
<p>Our <a href="http://help.prusa3d.com/article/customer-support_2287">technical support</a> is available at any time. Do not hesitate to contact us to report the BSOD. </p>
<p>If requested from our side, with a USB drive inserted into the printer, go into the printer menu to <em>Settings -&gt; System -&gt; Save Crash Dump</em>, and send it to <a href="mailto:reports@prusa3d.com" subject="Crash Dump BSOD" body="TEXT">reports@prusa3d.com</a> so we can check the best way to solve the problem. However, please note that this email address is not for our technical support. </p>
<p>Please follow these guidelines when sending the crash dump. </p>
<ul>
<li>Do not share crash dumps publicly, for security reasons. </li>
<li>Include the following information when sending the crash dump:
<ul>
<li>Printer model and serial number.</li>
<li>Although we expect the printer to be running the most recent firmware, include in the information the firmware version installed on the printer. </li>
<li>Description of the problem.</li>
<li>Description of the last few steps before the BSOD occurred, or any steps to reproduce it. </li>
<li>Let us know if the printer is connected to the network (i.e. PrusaConnect, Octoprint, etc.)</li>
<li>Let us know if there are third-party components installed on the printer (RPi boards, LED lights, cameras, Bondtech mods, UPS batteries, etc.)</li>
</ul>
</li>
<li>Additional information if applicable:
<ul>
<li>Pictures and/or video of the issue. </li>
<li>Print files that may help to reproduce a problem in the middle of the print. </li>
</ul>
</li>
</ul>


Blue Screen of Death (BSOD)

<h3>What happened?</h3>
<p>The <strong>Prusa CORE One</strong>, and the <strong>Original Prusa MK4/S</strong>, <strong>MK3.9/S</strong> are equipped with a <strong>loadcell</strong>, which detects whether the nozzle is close enough to the steel sheet for printing and prevents damage from the nozzle digging into the steel sheet. </p>
<p>The loadcell sets itself a reference, called <strong>tare</strong>. In case there is an issue during this procedure, the printer will show the message: <strong>"Setting the tare failed. Check the loadcell wiring and connection."</strong></p>
<p>Error name: Loadcell Tare Failed </p>
<p>Error code: #31525 (CORE One) #26525 (MK4S) #13525 (MK4) #27525 (MK3.9S) #21525 (MK3.9)</p>
<h3>How to fix it? </h3>
<h4>A visual inspection</h4>
<div class="warning-callout">Before you start, make sure:</p>
<ul>
<li>the filament is unloaded from the extruder</li>
<li>the printer is turned OFF and unplugged from electricity</li>
<li>the hotend and the heatbed are cooled down to ambient temperature</li>
</ul>
</div>
<p>Access the right side of the LoveBoard, where the loadcell cable is connected. To remove the side LoveBoard cover, on CORE One loosen two<span style="color: #000000;"> <span style="color: #236fa1;"><strong>M3x6 bolts</strong></span></span>, on MK4/S and MK3.9/S loosen one <span style="color: #843fa1;"><strong>M3x10 bolt</strong></span>. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/c565b5d3a12f4e32b712cc273759d4e8_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Tare Failed REVIEW #31525 (CORE One) #26525 (MK4S) #13525 (MK4) #27525 (MK3.9S) #21525 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/94e576c7396585eb388df6fd136a8ec8_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<p>Once accessed, locate the <span style="color: #e67e23;"><strong>loadcell connector</strong></span> and cable, and check for any loose cable, disconnected cable, or visible damage. </p>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;">
<p style="text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/04/98f9151af765084ab2be69a52d63f20c_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></p>
</td>
<td style="width: 48.8562%; text-align: center;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/3c492d1b5efc9c403a26bd3c455c2ea7_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h4><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2025/01/5e54e7bdd6fef88f48746c4095106a4f.jpg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell Not Calibrated REVIEW #31523 (CORE One) #26523 (MK4S) #13523 (MK4) #27523 (MK3.9S) #21523 (MK3.9)" alt="" width="500" height="375" loading="lazy" /></h4>
<h4>Re-test the loadcell</h4>
<div class="warning-callout">Do not manipulate or touch the printer unless the instructions on the printer screen prompt you to do so.</div>
<div>
<p>Navigate to <em>LCD Menu -&gt; Control -&gt; Calibrations &amp; Tests -&gt; Loadcell Test</em> to initiate a loadcell test. </p>
<p>During the test, you will be asked to tap the nozzle at a specific time, and a progress bar shown on the screen is filled, depending on the pressure applied to the loadcell. If the bar is not filled or is filled irregularly, please contact our <a href="http://help.prusa3d.com/article/customer-support_2287">customer support</a>. </p>
<div class="tip-callout">Tapping of the nozzle can be done with a finger, as well as with a hard object. </div>
<table style="border-collapse: collapse; width: 100%; border-style: none;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/e03a4297a772916ed43b160f9300a4b6_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/3226ee7326e5f8c4057eb46f4d9f8a55_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<h3>Loadcell white pad - visual check </h3>
<div class="warning-callout">Ensure to have the <strong>PG-assembly-adapter</strong> before continuing with the following procedure. If you do not have it, you can print it using the below files, depending on the printer you will use: <br /><a href="https://files.printables.com/media/prints/451501/stls/4104840_55cb7d05-d1f6-4cca-8159-db9ac9f62942/pg-assembly-adapter-mk4-r1.stl">PG-assembly-adapter printed with MK4/S</a><br /><a href="https://files.printables.com/media/prints/451501/stls/4240522_6fa05937-693e-4282-8dce-a98d3e93fd5f/pg-assembly-adapter-mk3-r2.stl">PG-assembly-adapter printed with MK3/S/+</a></div>
<ol>
<li>If any filament is loaded, unload the filament, then wait for the printer to fully cool down. After that, turn the printer off.</li>
<li>Remove the PG-case, together with the PG-ring, gearbox, and main plate. Remove all of these parts in one piece. </li>
</ol>
<table style="border-collapse: collapse; width: 100%;" border="1">
<tbody>
<tr>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/1c7df54642bb103d2a7d3ed01b41cbff_painted.jpeg" alt="" width="395" height="296" loading="lazy" /></td>
<td style="width: 48.8562%;"><img decoding="async" src="https://cdn.help.prusa3d.com/wp-content/uploads/2023/10/67c593556671a61a79c52036477d3454.jpg" alt="" width="395" height="296" loading="lazy" /></td>
</tr>
</tbody>
</table>
<ol start="3">
<li>The top part of the loadcell is now visible and has a white pad attached to it. Without touching the white pad, check it for damage. </li>
</ol>
<p><img decoding="async" style="display: block; margin-left: auto; margin-right: auto;" src="https://cdn.help.prusa3d.com/wp-content/uploads/2024/11/4f0b8b4b2de761bec7c838efa8152ca9_painted.jpeg" sizes="(min-width: 1024px) 820px, 100vw" srcset="Loadcell troubleshooting" alt="" width="500" height="375" loading="lazy" /></p>
<ol start="4">
<li>Reassemble the block of PG-case, PG-ring, gearbox, and main plate. In case the parts are not in one block, follow the dedicated steps from the Nextruder <a href="http://help.prusa3d.com/attachment/ltlznibfugnpwtwy-jpg_272">assembly manual</a>, depending on your printer version. </li>
<li>Perform the <a href="http://help.prusa3d.com/article/gearbox-alignment-core-one-mk4-s-mk3-9-s_465779">gearbox alignment</a>. </li>
</ol>
</div>


Loadcell Tare Failed #31525 (CORE One) #26525 (MK4S) #13525 (MK4) #27525 (MK3.9S) #21525 (MK3.9)


<ul>
<li>Prusa Connect integration</li>



<li>Prusa Account integration</li>



<li>Improved UI</li>



<li>Improved G-code Viewer</li>



<li>New system profile updating system</li>



<li>Single Perimeter for top and bottom layers</li>



<li>Extended SLA layer separation configuration</li>



<li>Bug fixes</li>
</ul>


2.8.0

1.00


<ul>
<li>Issues with numeric keyboard repaired (MK4/S, MK3.9/S, MK3.5/S, XL)</li>



<li>Returned nozzle diameter setup (XL)</li>



<li>Printhead position during calibrations changed (MK4/S, MK3.9/S, MK3.5/S)</li>



<li>Cold pull (XL)</li>
</ul>


6.1.3


<ul>
<li>Improved menu bar, the menu no longer hides under a button</li>



<li>Two new parameters (Abrasive material and High flow nozzle) for G-Code checks</li>



<li>Improved automatic orientation of bridges</li>



<li>Number of bugfixes</li>
</ul>


2.8.1


<p>Correction of product information</p>



<p>Minor content updates</p>


1.01


<ul>
<li>Multiple beds and bulk export</li>



<li>Scarf seams</li>



<li>Printables integration</li>



<li>Paint-on fuzzy skin</li>



<li>Improvements in painting tools and multi-material slicing</li>



<li>Basic support for printing with different nozzle diameters</li>
</ul>


2.9.0


<ul>
<li>Added an option to save printer logs to a text file</li>



<li>Expanded GPIO functionality (MK4/S, MK3.9/S, MK3.5/S)</li>



<li>Toolhead and hardware menu overhaul</li>



<li>Improved filament management</li>



<li>“Set Ready” button</li>



<li>Connect header status icon</li>



<li>Nozzle information for Prusa Connect</li>



<li>Mapping screen from Prusa Connect</li>



<li>Japanese language support on MINI</li>
</ul>


Original Prusa MK3.9S