Originally shared by Jeff Keegan I think one of the LM8UU bearings on my

3D Printing
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Originally shared by Jeff Keegan

I think one of the LM8UU bearings on my Prusa i2 went bad (at least that’s my best guess). The X axis has extreme trouble moving to the right (it stutters and skips), but it can usually move left fine. If I spray it that morning with silicon lube, it’ll sort of work for a while (but I think that’s just lubricated metal rubbing against metal on a broken bearing). The smooth rods have long sharp scratches in them now. Grrr. Because of the style of the i2 ends, the rods are trapped so I can’t replace them without basically removing the entire Z axis to get at the X axis. Maybe I’ll go with printed PLA bushings instead… Anyone have this happen?

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Happened to me a few years back. That was due to a few of the bearing balls popping out of the lm8uu when inserting the smooth rod, in combination with a slight binding on the axes. The rods had some pretty nasty scars after that.
That’s what happen to cheap bearings I guess. Printed beaeings work, but I don’t know for how long. I’d suggest you just replace them, they’re cheap anyway.