Sync Wheel Pulley drive normally attached on the stepper motor to move actively with the timing belt, that’s why sync wheel drive without bearing. And the number of teeth is matter and affecting the movement speed, accurate of print result, so if you change different size , different number of teeth sync wheel remember to do the calibration. Also need to remember the lock securely on the stepper motor with the small screw, otherwise it may have movement skipped. This item is for 10mm open or closed loop timing belt for 3D printer SpecificationsSpecifications:20 Tooth idler pulley H-type synchronous pulley wheel Tooth width : 10mm Material: Aluminum Tooth: 20 (T) Belt Width: 10 (mm) Height : 19.5mm Unit diameter : 16mm Center hole diameter : 5mm / 8mm |