YEHAM 4Pcs 8mm LM8LUU 8x15x45mm Longer Linear Motion Ball Bearings For CNC Tools

I ordered these 2 months ago as I planned to eventually eventually use them as replacements on my 3D Printer. I opened the package today and found there was only two bearings, seems I only received half of what I was supposed to get. Unfortunately as I didn't need them urgently, the return window has since closed.I went ahead and installed the 2 that I do have and had to overnight a second set (different company this time).While one seems to work okay, the other one is worse than the busted bearings it replaced. Overall at only 50% success rate, they seem to have poor QC on these and I would advise getting the bearings elsewhere.

the headline says it all. carefully packed these with grease, and installed on a month old wanhao i3 plus. within two days all of the grease ended up on the rails of the print bed, (the seals should have kept the grease in the bearing housings) and the bearings sounded like gravel had been jammed into them. not even a smooth travel action with the motor disengaged. pretty much junk, purchase your bearings from a different seller !

I replaced the bearings on the bed of my Monoprice 13860 Maker Select 3d Printer V2 with 4 of these as the 3 it came with were subpar, you could feel them binding and sounded like they had sand in them. I replaced the carrier with an 1/8" aluminum piece and went with the 4 of these and it now feels very smooth when you move the bed by hand and no noise.

The bed bearings on my Monoprice Maker Select 3D v2 went bad after a week of use. I upgraded to these longer bearings. I have the plastic bearing holders that just hold the bearings by friction so it was very easy to change to these. So far they are very smooth. No Noise.

Made a horrible grinding noise. I sent them back

Good replacement for select-mini parts that were loose on arrival.

one the balls just fell out of, the rest are really mediocre. Decided to get other bearings rather than ruin my rods.

These sat in a box for months, when I finally used them as my printer's original bearing was getting squeaky as rubber seal had deformed.These bearings were kinda loose on the shaft.Fits loose-but-ok on my 7.985 mm rodFits too loose on my 7.97 mm rod.These were cut from the same rod, so the error's as likely in measurement. But the end result is the bearings don't move nicely. I ended up replacing one bad bearing and reusing one old one.