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1c. Parts preparation

1c. Parts preparation
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Last updated a month ago
1c. Parts preparation
 Difficulty
Easy
 Steps
27
 Available languages
CSPLDEESITFRJA
Removing the heatbed cable cover
Removing the heatbed cable cover
Removing the heatbed cable cover
Removing the heatbed cable cover
In the upcoming steps, you will replace the old heatbed thermistor (from your previous printer model) with a new version that is compatible with MK4S, MK3.9S, and MK3.5S.
If you purchased a new heatbed with the upgrade kit — commonly for users with printers featuring 2+1 screws on the old heatbed — ensure that the new thermistor is pre-installed. You can easily verify this by checking for a white connector at the end of the thermistor cable. The presence of this connector indicates that the new thermistor is already in place and you can skip to M3nEs nuts: parts preparation
This part may vary slightly in the design of the cover, location of the screws and number of the screws.
Remove the screws fixing the cable bundle.
Remove the screw securing the cover. From the underside, grasp the middle M3nN nut with the pliers while loosing the screw.
Remove the cover.
Release the screws fixing the heatbed power cables and remove the cables from the heatbed. From the underside, grasp the M3nN nuts with the pliers while loosing the screws.
Removing the heatbed thermistor
Removing the heatbed thermistor
Removing the heatbed thermistor
From the bottom side of the heatbed, peel off the yellow Kapton tape and silver aluminum tape.
Remove the heatbed thermistor cable from the heatbed.
New heatbed thermistor: parts preparation
New heatbed thermistor: parts preparation
For the following steps, please prepare:
MK4 Heatbed thermistor (1x)
Kapton tape (1x)
Aluminum tape (1x)
Pay attention to the instructions! The "yellow" Kapton tape tends to curl up and you won't be able to restore its initial shape!!
All the necessary parts can be found in the Heatbed thermistor set bag.
Preparing the heatbed and thermistor
Preparing the heatbed and thermistor
Preparing the heatbed and thermistor
Preparing the heatbed and thermistor
After you have removed the thermistor and the tapes, clean the entire board to remove any grease. You can leave the glue, which was under the aluminum tape.
Place the thermistor on the heatbed. The tip of the thermistor must be in the circle.
If you miss this spot, the printer will read incorrect temperature values.
Note which side the sensor is attached to the heatbed.
Take the silver aluminium tape and carefully peel off the protective film.
Glue the tape to the heatbed, BUT ONLY in the centre of the thermistor (inside the circle shape). We need to double-check the correct position.
Peel or bend the tape slightly, to reveal the tip of the thermistor.
Covering the thermistor
Covering the thermistor
Maintain the thermistor position and cover it with aluminum tape. Ensure that the whole thermistor sensor is covered with the tape.
Fixing the thermistor in place
Fixing the thermistor in place
Fixing the thermistor in place
Fixing the thermistor in place
Now it is time to apply the final "yellow" Kapton tape. DON'T PEEL OFF the entire tape, it will curl up!!!
Peel off about 1 cm (0.5 inches) strip of the Kapton tape and stick it to the heatbed, like in the picture. Ensure the tape is properly connected.
Make sure the Kapton tape does not overlap any screw holes in the heatbed.
The Kapton tape has a bigger area than the silver tape. Make sure the silver tape is overlapped from all sides.
Continue with gluing the tape and stop for a second above the area with the thermistor. Pay great attention to sticking the tape everywhere.
Finish gluing the tape to the heatbed. Double-check the entire surface is properly connected.
Inserting the M3nEs nuts
Inserting the M3nEs nuts
Inserting the M3nEs nuts
Inserting the M3nEs nuts
Insert the M3nEs nut into the left short extrusion (side without the PSU). Insert the side with the spring (metal plate) first.
Push the entire nut inside the extrusion using your finger.
Use this method for both M3nEs nuts. The exact position of the nuts doesn't matter at this time.
Installing the cable clips
Installing the cable clips
Installing the cable clips
Installing the cable clips
Turn the frame like in the picture and focus on the marked area
Take one of the cable clips and hook the side with the clip into the inner groove of the lower longer extrusion. There is a hook on the part, see the detail.
Place the other end of the clip on the underside of the extrusion.
Use more force to push on the bottom side of the cable clip. It must fit into the groove and you must feel it "click" in.
Installing the cable clips
Installing the cable clips
Installing the cable clips
Install three clips to the long extrusion.
Install two clips to the short extrusion.
Turn the frame, install two clips to the second short extrusion.
PG-front-case: parts preparation
PG-front-case: parts preparation
For the following steps, please prepare:
PG-front-case (1x)
Spacer 13x24x2.5  (1x) can be black or white
Spacer 13x24x2.5 can be found in the NEXTRUDER bag and it can be black or white.
Assembling the PG-front-case
Assembling the PG-front-case
Assembling the PG-front-case
Place the spacer into the circular recess in the PG-front-case and push it all the way down. Note the correct orientation of the washer.
The side of the washer with the three circles must not face up! Otherwise, the planetary gear won't work properly.
Make sure the washer is pushed evenly into the printed part.
Stickers and labels: parts preparation I.
Stickers and labels: parts preparation I.
For the following steps, please prepare:
All the stickers and labels can be found in the UPDATE STICKERS bag.
xLCD-cover (1x)
PG-front-case (1x)
xLCD-cover MK3.9 sticker (1x) rectangular shape, optional
PG-case MK3.9 sticker (1x) square shape, optional
Serial number label (1x) silver label
The list continues in the next step...
xLCD-cover sticker (optional)
xLCD-cover sticker (optional)
xLCD-cover sticker (optional)
xLCD-cover sticker (optional)
This and the following step are optional. Also, please BE PATIENT, smaller letters require more effort in order to be transfered and glued properly.
Using the cleaning pad, clean the side without the circle hole on the xLCD-cover.
Peel off a piece of the protective layer and carefully glue the sticker on the xLCD-cover. Maintain the sticker aligned with the edges of the display cover. Start on the bottom side.
Notice the white PRUSA lettering through the sticker. Compare the orientation with the second picture.
After gluing the sticker, run your finger along the entire length of the sticker in all directions to ensure perfect adhesion.
xLCD-cover sticker (optional)
xLCD-cover sticker (optional)
xLCD-cover sticker (optional)
This process requires patience and care. Perfect adhesion depends on proper degreasing of the part and the ambient temperature.
Start slowly peeling off the application layer. Lightly press the layer onto the lettering as you peel it off. Observe whether all the letters are glued on.
After peeling off the application layer, check that the final look matches the picture.
PG-case sticker (optional)
PG-case sticker (optional)
PG-case sticker (optional)
PG-case sticker (optional)
This and the following step are optional. Also, please BE PATIENT, smaller letters require more effort in order to be transfered and glued properly.
Using the cleaning pad, clean the front side of the PG-case.
Peel off a piece of the protective layer and carefully glue the sticker on the PG-case. Maintain the sticker aligned with the edges of the cover.
See the detail to ensure the correct orientation of the sticker. Use the screw holes as a guide.
After gluing the sticker, run your finger along the entire length of the sticker in all directions to ensure perfect adhesion.
PG-case sticker (optional)
PG-case sticker (optional)
PG-case sticker (optional)
This process requires patience and care. Perfect adhesion depends on proper degreasing of the part and the ambient temperature.
Start slowly peeling off the application layer. Lightly press the layer onto the lettering as you peel it off. Observe whether all the letters are glued on.
After peeling off the application layer, check that the final look matches the picture.
Sticking the serial number label
Sticking the serial number label
This step is required in order to provide warranty! Don't throw the label away!
Peel off the protective layer from the rear side of the label.
Glue the label on the left side of the rear plate. Make sure, the surface is clean. Use the supplied cleaning pad.
Safety label (optional)
Safety label (optional)
Safety label (optional)
Take a look at the front side of the printer frame. There should be a yellow safety label on the right side of the frame.
Peel off the label.
Use the supplied cleaning pad to wipe the area where the label was applied.
Take a new safety label. Peel off the bottom protective layer from the label and glue the label on the clean surface of the frame.
Please note that the following pictures in the manual were taken with a previous (yellow) version of the safety sticker. This is because they were taken before the new sticker was available.
Parts summary I.
Parts summary I.
Parts summary I.
Put aside the following  prepared parts for the next chapters:
Printer frame with the PSU (1x)
Y-carriage (1x)
Smooth rod 8x370 mm (2x) X-axis
Smooth rod 8x330 mm (2x) Y-axis
LM8UU bearing (6x) from X and Y-axis
The list continues in the next step...
Parts summary II.
Parts summary II.
Parts summary II.
Parts summary II.
Heatbed (1x)
X motor (1x)
Y motor (1x)
Z motor left (1x)
Z motor right (1x)
Trapezoidal nut (2x)
All the parts you printed for the upgrade.
Don't throw away
Don't throw away
Retain the power cord to the PSU, flexible steel sheet(s) and spool holder to use the printer.
You will no longer need the parts not listed for the upgrade. Keep them aside to avoid mixing with new parts.
Still no sweets?
Still no sweets?
Please don't open the bag yet.
But you are getting close to your first taste ;).
That's it
That's it
Once you have all of the parts listed, proceed with upgrading your printer.
Enjoy the assembly.
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