Transmission PulleyChina 3D Printer Kit 2gt 20 Teeth Synchronus Wheel Idler Pulley Gt2 Timing Pulley 16/20teeh Bore 3mm 4mm 5mm Gear for Gt2 Timing Belt, Find details about China Extruder Gear, Mk7 Extruder Gear from 3D Printer Kit 2gt 20 Teeth Synchronus Wheel Idler Pulley Gt2 Timing Pulley 16/20teeh Bore 3mm 4mm 5mm Gear for Gt2 Timing Belt