Clicking & squeaking noises in the X-axis belt pulley

Clicking & squeaking noises in the X-axis belt pulley  

New Member

The pulley in the end of my MINI's X-axis is noisy. It clicks when the X-axis moves long distances. If I look into the end of the X-axis, I can see the pulley slowly shift to one side and then click when it hits the side of the housing. It looks like the pulley is getting snagged by the bolt running through it and getting screwed into the side of the housing until it pops. The pulley clicks about 3 times when the X-axis travels the full distance.

The pulley also squeaks sometimes during shorter moves. It looks like sometimes the pulley does not click back into the center, but instead stays close to the side of the housing and squeaks.

What can I do to fix this? It doesn't appear to interfere with prints, but the noise is annoying, and I'm worried about long-term wear. I don't know whether this needs tightening, loosening, lubrication, etc.

Posted : 04/08/2020 5:45 am
New Member

I've had my mini for 3 weeks.  I had squeaking at the beginning. It got better when I adjusted the tension in the screw that goes through the pulley.

Just in the last few days, I started getting the clicking, but I haven't been able to make it any better, though. 🙁

Posted : 04/08/2020 9:21 pm
Veteran Member Moderator

on my mk2 and 3 I had an X idler fail on two printers. 
the single bearings collapsed. now I use two bearing idlers off Ebay. 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 04/08/2020 10:19 pm
New Member

I did not know that part was called an "idler pulley." Thank you, that made it much easier to find more information! I saw that it might be caused by a failed bearing, an over-tight belt, and a few other things. Ultimately I just tried adjusting all of the bolts in the end piece until I found something that helped. A quarter turn tighter on the pulley itself dampened the noise, and another quarter turn silenced it.

I'll have to see whether the clicking returns later. If the belt is over-tight, then I suspect that it'll just work that bolt loose again. The X-axis was quiet when I first got the printer; the noises only developed after about 3-4 days of use.

Posted : 04/08/2020 11:38 pm

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