Solid Polymer LM8UU Bearing 8mm Shaft - Igus Drylin RJ4JP-01-08 for Anet A8 Prusa i3 3D Printer RepRap 10PCS

A little too perfect. When switching to these bearings be prepared for a little extra work. What you could get away with using the "other" bearings wont fly when using these. If using printed parts make sure you have an extra pla one. with my xcarriage the petg one I had shrunk up just a bit too tight so I went back to my pla one, perfect. Keep everything parallel and tolerances tight. These bearings are not the least bit forgiving..