uxcell LM30UU Linear Ball Bearings 30mm Bore 45mm OD 64mm Long for CNC Machine 3D Printer 4pcs

Great 30mm bearings used to replaced in my Harbor freight Chicago electric miter saw.

I purchased these to replace grinding bearings in my sliding miter saw, they are longer than my stock bearings but I think it honestly help provide more stability. They slide very smooth, better than stock, and function exactly as expected. No more noise and jerky motion while sliding and at a way lower price than purchasing a new saw.

I bought these to replace a bad bearing on my Prusa Mk3. The old bearing was missing a couple balls and made a bad noise. These were worse than the original broken one. There was a lot of slop on the rod and they were very rough. I put the broken one back on until I can find a better replacement

Not bad compared to a different brand I recently bought. These slid easily on the 12mm rails I bought. One of them was gritty and probably won't use it

Bearings were great right out of the box. No problems. Used them on a 10mm linear shaft for a 3D printer. Been working ever since

Had some noisy bearings on sv06+. Bought both 4 of these and 4 of Aopin. Not sure if it was just luck but the Aopin felt far smoothe and were much quieter. 1 of 4 of these had a slight clunky feel when moving on rod. 2 of 4 felt sloppy, I could wiggle them slightly back and forth on the rod. I ended up using 1. The other 3 will work in a pinch. Or I want to build a lower res printer. But I'll likely just buy more of the other brand for 50 cents or so more.

Used to rebuild small CNC machine. These have outlasted the original.

Excelente