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1. Y-axis parts info

Step 1 of 16 (Chapter 2 of 8)

Contents

Comments

In this chapter, you will upgrade the old Y-axis belt tension mechanism with new parts printed from PCCF material.

⬢The latest MK4 units might already include Y-axis parts upgraded to PCCF. If your printer has these, you can skip this chapter.

⬢To verify, take a closer look from the underside of the Y-carriage and inspect the parts:

⬢New Y-axis parts: PCCF has a dull, slightly grayish texture

⬢Old Y-axis parts: PETG is glossy black

Ensure you thoroughly check before skipping.

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

1. Introduction
2. Upgrading the Y-axis
3. Upgrading the xLCD
4. Upgrading the Nextruder
4B. Upgrading the Nextruder (MMU3)
5. Upgrading the connectivity
6. Preflight check
Manual changelog

Comments

venti

•

Could not do the upgrade, wasted 1h. At step 7 the nut is not supposed to be able to rotated freely in the part. It did in my part. Missed this and thus I was not able to finish step 11. Not a good experience. Had to undo the upgrade and use the old part which was snug enough to catch the nut. Not a good experience at all

Elle Skye

•

PETG will probably be fine, it just can warp a bit easier than PCCF, it seems prusa has been moving to more PC type parts for strength / reliability

TORP3DO

•

I have the same issue, in the beginning I thought the screwhead was rounded and I didnt figure out, that the nut was spinning. Also wasted at least one hour, trying to get the belt to the correct tension.
The other PCCF part also snapped along the layer lines, since I tried a couple of times and as a last resort, I tried to us only the 2 screws into the heatbed to tension the belt.
Also not a good experience for me, very frustrating. First time I had anger following a prusa manual.
I will now use the old PETG parts and hope this will be better.
The tolerance on the Nut needs to be firmer, to keep it in place and also so it doesnt rotate. It kept falling out, and the tutorial showed me, how to get it in, but I could just drop it ...

JMH714

•

I'm using the modified part which is better than what Prusa provide (https://www.printables.com/model/814369-mk4-y-axis-overhaul-reduce-vertical-artifacts-on-y)- I guess I'll have to reprint the parts to ASA instead of originally PETG.

Luis GG

•

Always keep the old parts just in case (see comment on the tensioner steps below)

Erik

•

I had to reprint these parts recently (prior to upgrade to 4S). When I did, I used Prusa PC-CF for them.
Are these the same design as in the Mk4 build and the only difference is that they're PC-CF, or is it a different design? Meaning, should I use the included parts if I've already printed the Mk4 version in PC-CF?
TIA, Erik

Jan Kratochvíl

•

Hello. The parts should be the same; the only difference is the material.

J Igims

•

My PC upgraded parts cracked (belt tensioner) and broke during the install.... anyone else have this issue?

Mad_Dr_Pepper

•

Same

noah.s.coleman

•

I also had this issue

1. Y-axis parts info

Step 1 of 16 (Chapter 2 of 8)

Contents

Comments

In this chapter, you will upgrade the old Y-axis belt tension mechanism with new parts printed from PCCF material.

⬢The latest MK4 units might already include Y-axis parts upgraded to PCCF. If your printer has these, you can skip this chapter.

⬢To verify, take a closer look from the underside of the Y-carriage and inspect the parts:

⬢New Y-axis parts: PCCF has a dull, slightly grayish texture

⬢Old Y-axis parts: PETG is glossy black

Ensure you thoroughly check before skipping.

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

1. Introduction
2. Upgrading the Y-axis
3. Upgrading the xLCD
4. Upgrading the Nextruder
4B. Upgrading the Nextruder (MMU3)
5. Upgrading the connectivity
6. Preflight check
Manual changelog

Comments

venti

•

Elle Skye

•

PETG will probably be fine, it just can warp a bit easier than PCCF, it seems prusa has been moving to more PC type parts for strength / reliability

TORP3DO

•

JMH714

•

Luis GG

•

Always keep the old parts just in case (see comment on the tensioner steps below)

Erik

•

Jan Kratochvíl

•

Hello. The parts should be the same; the only difference is the material.

J Igims

•

My PC upgraded parts cracked (belt tensioner) and broke during the install.... anyone else have this issue?

Mad_Dr_Pepper

•

Same

noah.s.coleman

•

I also had this issue