MAKE: - The dimensions in the model are optimised for printing at 0.2mm layer height. Printing at other layer heights such as 0.24 or 0.15 would cause Z dimension inaccuracy. - Print the 48 teeth pulley at 0.1mm height with extremely slow outer wall speed (under 10mm/s). Use glossy material instead of matte. - Retract at all times while printing the frames. Otherwise the filament will ooze during travel and cause under extrusion at perimeters. - No support needed for the three frames and bearing holder. - Print top and base plate of frame at 100% infill. The compression spring apply massive force to the left side of top plate. Make sure it's rigid. - Rub the cylinder pin on hard surface such as concrete or stone to turn it into a D shaft - For Ultimaker 2, add a piece of 1mm silicon sheet between the motor and frame. This will reduce the retraction noise of motor vibrating frame BOM: Belts & Pulleys 1 x GT2 6mm Socket Pulley 48 Teeth (printed) 1 x GT2 6mm/10mm Pulley 5mm Bore 16 Teeth 3 x GT2 6mm Pulley 5mm Bore 20 Teeth - 16x16mm, M4 set screw 2 x GT2 6mm Belt 65 teeth - 130mm Bolts & Nuts 2 x M3x16 Flanged Button Head Allen Bolt 5 x M3x12 Flanged Button Head Allen Bolt 4 x M3x30 (Flanged) Button Head Allen Bolt 1 x M3x20 (Flanged) Button Head Allen Bolt 2 x M3x12 Countersunk Socket Allen Bolt 6 X M3 Standard Hex Nut 2 x M4x10 Button Head Allen Bolt 2 x M4x10 Grub Screw Socket Set Flat Point - DIN 916 2 x M4 Standard Hex Nut 1 x M6x16 Countersunk Socket Allen Bolt - DIN 7991 1 x M6 Square Nut - DIN 562 Others 2 x Gear Drive - stright teeth gear for 1.75, Ultimaker gear for 2.85/3.0 2 x Cylinder Pin 5x45 1 x Cylinder Pin 5x30 6 x Bearing 605ZZ 5x14x5 2 x Bearing 624ZZ 4x13x5 1 x Ultimaker 2 Bed Compression Spring 7x9.4x1.2 16mm 1 x 1mm thick Silicone sheet - larger than 42x42mm (optional) 1 x 1.8° NEMA17 Stepper Motor - D Shaft of 5x24mm (optional) 1 x PTFE Bowden Fitting