Original Prusa i3 MK2S is a successor to Original Prusa i3 MK2 with small hardware tweaks for easier assembly and improved reliability.

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Re-tighten the y-axis belt

Hey everyone,

I just assembled my Prusa i3 MK2s kit a few days ago and it is running not perfectly but pretty well. Nevertheless I am quite sure that the y-axis belt is not tight enough. Compared to the x-axis belt it appears to be very loose. The x-axis belt does the mentioned "bass guitar sound" when picked, but the y-axis doesn't make any sound at all.

My question is: Is there any possibility to re-tighten the belt without disassembling the whole printer? I couldn't find any tutorials or similar.

Some advice would be great!

Answered! View the answer I have this problem too

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Hi Sören,

yes, you can do that quite easily, the Y-axis motor is fixed by two screws, so:

1) release the bottom one and create "a hinge"

2) rotate the motor towards the centre to loosen the belt

3) adjust the belt in the Y-belt-holder part

4) rotate the motor back (don't tighten)

5) check the tension in the belt

6) Is it ok? Yes? Proceed. No? Go to point 3

7) Tighten the motor

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Thanks alot!


You are welcome ;)


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Sören Intemann will be eternally grateful.
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