Sync Wheel Pulley make the timing belt move and the X, Y, Z axis will move up and down, left and right, toward and backward. Please beware as there are different tooth for Idler Pulley, the tooth number will affect the speed, syncing, accurate of printing. And you will need to redo the calibration for your 3D printer after you put different tooth and different size Idler Pulley. SpecificationsSpecifications:20 Tooth idler pulley H-type synchronous pulley wheel Tooth width : 6mm Material: Aluminum Tooth: 20 (T) Belt Width: 6 (mm) Height : 16mm Unit diameter : 16mm Center hole diameter : 8mm |