WINSINN GT2 Idler Pulley - 20 Teeth, 5mm Bore, for 6mm Width Timing Belt, Aluminum - Ideal for 3D Printers, CNC Machines (5-Pack)

I used these WINSINN GT2 idler pulleys as part of a custom CNC printer project, and they worked out better than expected. The aluminum feels solid and well-machined, and the 20-tooth profile lined up perfectly with my 6mm timing belts.Installation was quick—everything fit snugly on the 5mm shaft, and the movement stayed smooth without any wobble or noise.I’d definitely use them again on future builds. If you're working on a 3D printer or CNC system, this will do the trick. Reliable, clean finish, and no headaches.

Installed on my monoprice maker select v2 instead of the smooth idler pulleys that come from the factory. Correct size.

I busted some other ones I had, so these come to the rescue, the bearing has been working reliably enough.

came in faster then shipping stated.. have ran them for a while and no issues at all with the bearings.. highly recommend the seller

The toothed belt running over the smooth idler bearings on the Stock Ender 5 Plus belt tensioners was causing patterns in my prints with any speed over 20mms. No one makes an after market set of belt tensioners that use these toothed idlers, so I made my own. I was instantly able to more than double print speed. After dialing in the belt tension I am now able to print at 90mms. That’s 350% faster because the idlers now mesh perfectly with the toothed belts.I’d say they are worth it

These are built to last, affordable and a perfect addition to anyone building a 3d printer, laser engraver etc, have purchased these a few times.

Bearings were a little rough.

Good set of idler pulleys. Used for my 3d printer to make my z axes belt driven.