3mm Airtripper's Bowden Extruder for M6 nuts

THIS DESIGN IS UNLIKELY TO WORK WITHOUT GEARBOX!

Use a very powerful steppermotor, gearbox or just switch over to 1.75mm filament.

Use this planetary gearbox for example:
http://www.thingiverse.com/thing:8460

This is an custom version of the Airtripper Extruder to use with 3mm filament. A M6 Nut will fit perfectly.

for more 3D printer crazyness: http://www.femoral.de (German)