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 6mm open or closed loop timing belt for 3D printer
Dual Slot Sync Wheel Idler Pulley mainly use for synchronize two rod Z axis, or any other special use.
20 Tooth idler pulley
H-type synchronous pulley wheel
Tooth width : 9mm for both side
Tooth: 20 (T)
Belt Width: 5 - 9 (mm) per Slot
Height : 27.5mm
Unit diameter : 15.5mm
Center hole diameter : 5mm / 8mm