Thank you very much guys. I did just as you said and voila! No more clicking sounds.
- 3 years later...
I'm having a similar issue and it seems the ticking is coming from my Z access ball screw rod. I can actually feel the ticking if I lightly touch the rod.
Nothing seems to be protruding that I can see.
This is on a UM3
its normally the whole shaft moving and the black spacer hitting the bearing. you need to loosen the pulleys and push them against the side so the shaft cant move from side to side.
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