BIQU Extruder Pulley 36Teeth Bore 5mm Stainless Steel Drive Gear for 1.75mm & 3mm 3D Printer Filament (Pack of 5pcs)

They work great the higher teeth count eliminates grinding.

A vast improvement over my stock brass gears. If you are having extruder issues, this is well worth a try to fix the problem. Used on a stock Ender 3 extruder, and I had no need to change e-steps (checked before and after, same result). YMMV, but this fixed my under extrusion.

Fit perfect and worked great after e-step calibration on cr-10s.

Greatest

A little bigger than stated 5mm inside diameter.

Got these for the ender 3 extruder they work much better than the brass ones that came on it.

Works great and doesnt wear out on carbon fiber

Works well

The original extruder pulley that came with my 3D printer wore out very quickly. Replaced with this & works great. No more filament slipping.

Dropped right in, and did not need to recalibrate my e-steps. Good price, and quality.