An adapter for attaching a microdrill to Printbox3D One, a russian 3D printer. The drill diameter is 31 mm. Update: Modified lower holes to fit the X carriage; optimized for printing with less overhangs I got the drill from here: http://tixer.ru/catalog/instruments-and-tools/tools/equipment-for-drills/mikrodrel_md_3_nabor_tsang/?sphrase_id=168741 Use four M4 bolts to attach to the extruder holder and two M4 nuts with hubs to tighten the motor. Prints fine with 0.4 mm nozzle and 0.2 mm layer in 4 hours.