Quantity   Component name
3 × Dagu Omni Wheel - 40mm Omnidirectional wheel
4 × HS-422 Servo Motor Hitec Standard Deluxe Servo
1 × HS-645MG Servo Motor Hitec Ultra Torque Servo for the extruder
1 × Hotend MK7 0.4 mm nozzle for 1.75 mm filament
1 × Extrusion drive gear 12 mm OD, and 5 mm ID
6 × Listo optical mouse (1000 dpi) A dirt cheap and basic optical mouse with 1000 dpi resolution, and PS/2 interface
1 × Arduino DUE Microcontroller board based on the ARM Cortex-M3 CPU to handle all the real time stuff
1 × Raspberry Pi - Model B To make the 3D printer standalone, so no PC is needed (implements a web interface to the user)
1 × USB Wi-Fi dongle To connect to the 3D printer using a tablet or a smartphone
1 × Ball Bearing Similar to 608zz
1 × 1 m of PFTE tube With OD of 4 mm and ID of 2 mm
2 × Push fit tube connectors For 4 mm OD tube (BFE04.04.M6)
3 × Dagu Ball Caster - 16mm, 20mm Metal ball casters (don't expect all to be needed though)
1 × 1.875'' x 0.225'' Servo Wheel Pair (Hitec) Wheel to be directly attached to a servo