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HBK Linear Bearings Clicking

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Anyone else have linear bearings from the HBK that click when moving in one direction or another?

My click when pushing the bed down and less so when the stepper is used to move it down. However, manually moving the bed up doesn't result in the clicking noise.

It sounds like the ball bearings are "falling" inside the unit.


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I have the same issue. It was silent at first but now months later, not so much. It's a scary sound the first time I heard it. Sounded like something was cracking/splitting/scratching but after listening more closely I think it might be just loose ball bearings. Or maybe it's getting damaged every time I move it. Don't know. It only does it on a certain section of the movement. I have a UM2 also which gets more use so I don't worry about it too much but still...

The noise is much louder when pushing the bed down versus up.

I'm not sure but I think it's coming from the left bearing and not the main nut.


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The motion seemed a little sticky so I loosen things up and realigned. Afterwards, it was less likely to stick and the clicking went down some. When I say stick I'm talking about requiring more force to keep it going. However, the amount seems to be sooo much less than that produce by the stepper than it doesn't seem to affect prints.

The sound is a little like it is "gritty".

Yeah, pressing down seems to cause the most clicking.

As a young boy, my father had to repetitively tell me "if you look for problems you will find them" usually when I got a new toy and this is probably a similar situation....


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