4pcs KFL08 3D Printer Parts Horizontal 8mm Diameter Zinc Alloy Housing Pillow Block Bearing (Silver-Pillow Block Bearing KFL08)

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Use it to repair my monoprice 3D printer that made clicking noise on x axis(bearing shifted), those are in good condition vs some of the reviews, no damage upon receiving, not as smooth(not able to easily free spin) as the one I had on the printer but will do the job.

I've built and modified several 3D printers, and many designs use this type of bearing. As with many inexpensive bearings of this type, out of the box, the inner bearing spins freely, but the pivot part was completely seized. After popping the inner swivel assembly out and going over the mating surfaces with some fine emery cloth, cleaning and oiling everything, and reassembly, they are much better and actually pivot as they should. It also helps to make a jig with a clearance hole in the center to mount these to, so you can insert a shaft in the center and pivot these around to break them in a little. It'd be nice if they pivoted easily out of the box, but with a little time and attention, they turn out okay.

If you take a close look you'll see that the bearing is crooked...one side is higher than the other.

Manufacturing of the bearing is poor and it falls apart.

Poor Quality. Bearing didn’t hold in place.