WINSINN 2GT GT2 Aluminium Timing Belt Idler Pulley Tandloze 20 Tanden Tand 5mm Boor Voor 3D Printer 10mm Breedte Timing Belt

Bearings were a little rough.

Hood rollers and bearings but the cr-30 used 4mm inner bore not 5mm which is too loose. 4mm bore is hard to find and super expensive. Got a 5mm brass rod with 4mm inner diameter and sleeved these bearings and replaced all 8 on my cr-30 that had worn out.

Pulley set is made of a high quality aluminum, spinners function well, diameter matches description. Bought it for an Ender 3 Pro 3D printer but found out it does not work to replace any of the toothless pulleys on it. Diameter is too wide for front and side belt toothless pulleys and the inner hole diameter does not fit the screw for the back pulley. Will use these though on a Kossel 3d printer for the top pulleys. Price is reasonable for the construction.

I ordered this once I started hearing a crackling noise coming from my Y pulley on my CR10S4. This pulley was PERFECT. It took 2 minutes to install and now I'm back to perfect prints. THANK YOU AMAZON!

Nice concentricity and quality bearings. Nice addition to my CoreXY