-2x 16mm M3 screws -1x 20mm M3 screw -1x 624UU bearing -1x 16mm M4 screw + nut -1x 15mm long 8mm diameter strong spring (Ikea clothespin is perfect) -1x Extrusion Head Gear Inner Hole Diameter 5MM and 11mm outer diameter -1x Nema17 stepper motor