3A. MK3S+ extruder upgrade

Relevant for:

MMU2S

Last updated a year ago

Difficulty

Moderate

Steps

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Step 1 Extruder-body parts preparation

⬢For the following steps, please prepare:

⬢Adapter-printer-mmu2s

The package should include only the orange adapter. If you have printed parts yourself, please don't use the version with the hole for steel ball.

There are two different orange Adapter-printer-mmu2s parts for MK3S and MK3S+ included in the package. For MK3S+, pick the one seen in the picture.

Step 2 Adapter-mmu2-assembly

⬢Insert the Adapter-printer into the hole in the extruder-body. See the protrusion, it must fit into the groove.

⬢Push it down and check its upper surface is aligned with the extruder.

DON'T use any screw to secure the Adapter-printer-mmu2. It should hold inside the Extruder-body by itself.

In case you have trouble inserting it because of the fs-lever part in the extruder body, move the fs-lever away using a 2mm Allen key while inserting the Adapter-printer.

Step 3 IR filament sensor parts preparation

⬢For the following steps, please prepare:

⬢M3x18 screw (1x)

⬢M3x10 screw (1x)

⬢M3n nut (1x)

⬢FS-cover-mmu2s (1x)

⬢IR-sensor-holder-mmu2s (1x)

⬢IR-sensor-cover-mmu2s (1x)

Look for these parts in MMU2S FASTENERS and MMU2S EXTRUDER bags.

The list continues in the next step...

Step 4 IR filament sensor parts preparation

⬢For the following steps, please prepare:

⬢Prusa IR-sensor (1x)

⬢M2x8 screw (1x)

Be careful with the filament sensor, do not touch the components on the PCB. Hold the PCB by its sides.

Following assembly should be done close to the extruder, no need to pull the IR-sensor cable out. However, for a better visibility of this guide, some parts of the assembly were done separately from the printer.

MK3S+ and MMU2S share the same new generation of the IR filament sensor, just utilizing a different position in the extruder.

Step 5 IR filament sensor assembly

First, pull the IR-sensor cable up, so you have a slack for the assembly of the printed parts. At the same time watch the other end of the textile sleeve, if you pull the cable too much, the connector will disappear in the sleeve ;)

⬢Take the smaller connector WITHOUT THE SENSOR! and carefully push it all the way through the IR-sensor-holder-mmu2s.

⬢Once the connector is through, connect the cable and the sensor together.

⬢Make sure the safety latch is facing up.

⬢The sensor must be facing down.

Step 6 IR filament sensor assembly

⬢Take the IR filament sensor and place it in the holder, make sure the orientation is the same as in the picture.

⬢Take cover and place it on the top. The cover is asymmetrical, see the picture. One side has no "frame" on the bottom side of the cover. Point this side to the connector.

⬢Secure the IR filament sensor and the cover using the M2x8 screw you have removed from the extruder earlier.

Step 7 IR filament sensor assembly

⬢Carefully insert the cable in the channel, make sure it is all the way in.

⬢Take the FS-cover-mmu2s and push in the M3n nut.

⬢Slide the holder on the cover, again make sure it is all the way in, otherwise, the holes won't align properly.

⬢Secure both parts using an M3x10 screw, see the picture for the correct hole.

This entire IR filament sensor assembly is also called "chimney" in the Handbook.

Tip: If you can't reach the nut, try pulling it up using a longer fully threaded screw from the spare bag.

Step 8 Mounting the IR filament sensor

⬢Place the entire IR filament sensor assembly on top of the extruder.

⬢Align the left edge with the extruder body.

⬢Use a M3x18 screw to join both parts together.

⬢Carefully pull the cable down until the loop disappears completely. However, don't stretch the cable.

⬢Finish the sensor assembly by tightening the M3x40 screw.

⬢Make sure all the gaps are gone.

The IR filament sensor position will be calibrated later in the upcoming chapter. Without the proper calibration, the MMU2S won't be able to work properly.

Step 9 X-carriage retightening

⬢Tighten both M3x40 screws, make sure the printed parts are aligned before tightening.

⬢Tighten both M3x10 screws between the Extruder-body and X-carriage. Before you do so, ensure no cable is pinched between both parts, there is a channel in the X-carriage for all the cables.

Step 10 Hotend fan assembly

The fan has two sides, one has a Noctua sticker. Make sure, this side is facing inside the extruder.

⬢First, create a loop on the cable. Make sure the black protective wrap is close to the edge of the fan. See the picture.

⬢Slide the fan close to the X-carriage and GENTLY PUSH the cable in using an Allen key. Before you push the fan all the way to the left, place the cable in the X-carriage channel.

⬢Fix the fan using following screws (depending on the fan version):

⬢M3x14 / M3x16b screw (3x)

⬢M3x20 / M3x22b screw (1x)

Step 11 Extruder-idler parts preparation

⬢For the following steps, please prepare:

⬢Extruder-idler-mmu2s (1x)

⬢Bondtech gear (1x) you have removed from the original idler before.

⬢Bearing (2x) might be stuck inside the gear

⬢Shaft (1x)

⬢M3n nut (1x)

⬢M3x40 screw (2x)

⬢Idler spring (1x) place the spring on the screw. The screw with the spring might be already in the extruder

Step 12 Bearing assembly

⬢Insert both bearings into the gear. Be aware that bearings can slip out during assembly.

Step 13 Extruder-idler-mmu2s assembly

⬢Take M3n nut and place it in the Extruder-idler-mmu2s.

Use the screw pulling technique.

⬢Insert the Bondtech gear into the idler as shown in the picture. Make sure the geared part of the Bondtech is on the side of the plastic part with the cutout.

⬢Slide the shaft through the idler and pulley. Use reasonable force or you will BREAK the printed part.

⬢Place your finger on the bearing and ensure it can rotate freely.

Step 14 Extruder-idler-mmu2s assembly

⬢For this step, please prepare:

⬢M3x40 screw (1x)

⬢Place the Extruder-idler-mmu2s in place and secure it using a M3x40 screw.

⬢Don't tighten the screw too firmly, it serves as a shaft for the idler. Check that the idler can rotate freely (the range of the movement is small).

⬢Use the M3x40 screw with the spring to introduce tension to the Extruder-idler.

Hold the Extruder-idler on the other side, until the screw reaches the nut. Since there is only one screw, you need to introduce a large force. The head of the screw, should be aligned or slightly below the surface.

Step 15 X-carriage-back reassembly

⬢Rotate the X-carriage-back back and push it gently towards the extruder. Ensure no wires are pinched between both parts!!!

⬢Tighten all four M3x10 screws.

Tighten the screws with a reasonable force, make sure you won't deform/squeeze the bearings between the printed parts.

Step 16 Textile sleeve parts preparation

⬢For the following steps, please prepare:

⬢Zip tie (5x)

Step 17 Tightening the textile sleeve

⬢Gently twist the sleeve to make it smaller and tighter around the cables and slide the sleeve towards the extruder.

⬢Take 3 zip ties and insert them into the lower row of holes on the cable-holder.

⬢Twist the sleeve again (without twisting the cables inside) and tighten the zip ties.

IMPORTANT: Cut the remaining part of each zip tie using pliers as closest to its head as possible. Note the correct position of each zip ties's head (slightly off-centre to the left).

⬢Use two zip ties and push them through the upper slots on the cable-holder. Add the cables from the hotend and use the channel in the printed part to arrange them properly. Tighten the zip ties, cut the remaining parts.

Step 18 It's Haribo time!

Carefully and quietly open the bag with the Haribo sweets. High level of noise might attract nearby predators!

⬢Sort the bears into six rows according to the following scheme (colours might differ):

⬢Previous and current chapter were very difficult, at least 25 % of total amount is needed.

⬢Idler assembly is quite easy, 10 % is enough.

⬢Pulley body assembly requires your attention, eat no less than 20 % of all bears.

⬢Electronics assembly is the last chapter with high level of difficulty, consume 25 %.

⬢Spool holders with the buffer are easy to make, research shows that 10 % is enough.

⬢Preflight check is almost effortless. Experienced user will require no more than 10 %.

Step 19 E-axis is finished!

⬢Are we there yet? We are just getting started!

⬢Check the final look, compare it to the picture.

⬢Don't worry about the cable, we will connect it later ;)

⬢Checked everything? Let's move to the MMU2S unit assembly.

3A. MK3S+ extruder upgrade

3A. MK3S+ extruder upgrade

Step 1 Extruder-body parts preparation

Step 2 Adapter-mmu2-assembly

Step 3 IR filament sensor parts preparation

Step 4 IR filament sensor parts preparation

Step 5 IR filament sensor assembly

Step 6 IR filament sensor assembly

Step 7 IR filament sensor assembly

Step 8 Mounting the IR filament sensor

Step 9 X-carriage retightening

Step 10 Hotend fan assembly

Step 11 Extruder-idler parts preparation

Step 12 Bearing assembly

Step 13 Extruder-idler-mmu2s assembly

Step 14 Extruder-idler-mmu2s assembly

Step 15 X-carriage-back reassembly

Step 16 Textile sleeve parts preparation

Step 17 Tightening the textile sleeve

Step 18 It's Haribo time!

Step 19 E-axis is finished!

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