Aokin 3D Printer POM Wheel Plastic Pulley Linear Bearing for Creality Ender 3, Ender 3 Pro, Ender 3 V2, CR-10, CR-10S Series 3D Printer, 10 Pcs

They turn and keep the belt tight. Thats what they are suppose to do.

Took me a while to figure out why my first layers came out wavy looking and uneven. Changed out the wheels and now Im printing flat again. Good quality and good value.

after eating up the stock wheels from bad adjustments I got the clear poly wheels. the clear wheels made a ton of noise and left residue on my rails no matter how i adjusted them so I went back to stock. new wheels and a silent board make my printer damn near a ghost while running now

Finally pulley wheels that are round! Too many of the other ones Ive tried have been oblong and absolutely ruined my prints. With these, the first 3 I pulled out of the bag and installed were perfect and my printer is resurrected. I havent tried the rest yet, but the last batch I had from another brand were ALL bad. Do recommend.

Replaced two of the originals that had developed a flat spot on the wheels (due to a failure on my part to adjust at the onset). There was a clunking sound as the wheels hit the flat spots. I replaced them easily with two of these news ones, and the sound went away. Did have to re-level the bed, but that was expected. Have been working well since the installation.

This is the third set of rollers Ive ordered from various Amazon sources and so far, these are the best quality Ive received. All ten rollers look and work perfect. No surface defects on the plastic, no loose fitting bearings, no missing spacers. They worked perfect on my Ender 3 bed and X-carriage. They are well packaged and came with an information sheet. Overall, a very good purchase and Id buy them again.

Use these for 3D printer and laser biulds works great

Works as it should

Came in great shape and was able to swap out a few wheels easily on my Ender 3 V2

These are nice wheels. They have the same double 625ZZ shielded bearings as original wheels. I have checked all 10 wheels and all of them have a nice smooth rotation and they are not sloppy. These small bearings can take a surprisingly high load and I will use some of them for my other project.