- 1x 4in Neoprene Belt - 1x 4in Urethane Belt - 1x M3 25mm Screw - 5x M3 20mm Screws - 5x M3 16mm Screws - 6x M3 1.6mm Low-Profile Nuts - 5x M3 Washers - 5x 3x8x4mm Bearings (only one is required, others are optional for smoother performance) - 1x 6x6x3mm Metal Spacer (optional but prevents wear on the inlet) - 1x 8x5x3mm Metal Bearing (comes with original extruder) - 1x 16x8mm Spring (comes with original extruder)