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.

My printers original wheels had developed flat spots from having the eccentric nuts over-tightened, and were seriously messing up layer height consistency and positioning accuracy. These replacements were an exact fit and immediately fixed my problem. I just used 6 for the Z axis and kept 4 as spares.

Perfect fit. All 10 were in good condition with no defects detected. All I did was add a touch of liquid dry lube and they were very smooth. I will buy again if/when needed.

Picked up these to replace my Ender 3 wheels that were a year old. Direct replacement with no complaints. Worked as they should.

Great products

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.

I should have payed more for bearings, these things cut corners from the low quality grease to the inconsistent build quality to the sheer amount of friction in these even when warmed up. In the future I hope you can get in contact with your supplier and test the quality of a batch before someone else ends up halfway through a 3d printer rebuild only to find the old worn out bearings roll better than these. Sorry but now both our days are ruined.

I had a bad set of wheels on a Ender 3 Pro heat bed and replaced them with these wheels. The bed is much smoother now and the prints come out well. The original wheels from Creality were loose from the start even after tightening the bolts. These are more stable. They seem good quality. I guess time will tell how well they hold up but for now they are good. .