I used these to replace the LM8UU bearings on the Y axis of my Prusa i3 mk2. They made the movement quieter, but they're sloppy compared to the LM8UU bearings. That means there is play between the 8mm shaft and the bearings. This allows you to move along the Y axis while moving with high acceleration or deceleration. This leads to sloppy prints. Needless to say, the noisy (but stiff) LM8UU bearings are back in the printer and those IGUS bearings sit unused in the drawer. For those pondering, they are also 0.5mm larger. on OD. No mounting issues, but your build platform will rise 0.25mm when installed. Z-axis recalibration is required. Of course, every time you take your 3D printer apart, post-assembly calibration is required.
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