- 1 - MK8 drive gear - 3 - 5x5x16 bearings - 2 - 1/4" spacers - 3 - M5 nuts - 2 - M5 washers - 1 - M5x55 low profile hex head screw - 1 - M5x15 low profile hex head screw - 2 - M4 nuts - 2 - M4x50 hex head screw - 2 - M4 washers - 2 - Extruder springs(common reprap extruder springs) - 4 - M3 washers - 2 - M3 nuts - 2 - M3x15 hex head screw - 4 - M3x25 hex head screw