You'll need : -a few m3 screws (1cm and 2cm) -a fexible shaft (I bought a dremel-compatible flexible shaft from OBI; the house-brand) When you take apart the flexible shaft grip-end you need to scavenge the two ball-bearings (one smaller and one larger). -a still working printer to print the parts -a keyhole file to 'fix' the gears (they are too snug, but a bit of filing down the teeth fixes things; I used the stl files provided by rushgears.)