Major shift in x direction  

New Member

Hello all,

I have a 1.5yrs old Prusa Mini.

The x-axis print quality is very good. But when the head is moving quickly, there are a few clicks and then the whole print shifts a bit - sometimes 5-10mm.

I did first tighten the belt. When that did not solve the problem, I took the arm apart to confirm that the timing pulley (gear attached to the x-axis stepper and the belt) has the 2 grub screws tight. These are the ones that are at 90 degree angle from each other. I tried jiggling the gear and there was no sliding or play.

I noticed that when I spin the x-axis (yes, not good for voltage reasons) I am easily able to make the gears skip in the servo itself. Is this normal?

Should I look into replacing the servo, or is this just a belt FAQ and I'm making this more complicated than it needs to be? With a belt issue, I thought the clicking was the sound of the belt slipping across the timing pulley and not a metallic click from inside the servo itself.

Thanks. Any pointers would be appreciated


This topic was modified 2 months ago by kbrock
Posted : 19/04/2021 8:16 pm
New Member

looks like the timing pulley is probably called the motor pinion. it can be seen here

Posted : 19/04/2021 8:24 pm

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