Compact Bowden Extruder with HexNut Filament Holder

Remix of the Compact Bowden Extruder (http://www.thingiverse.com/thing:275593) with an M4 hexnut replacing the push-fit pneumatic connector (as used in the MOST RepRap extruder at http://www.appropedia.org/MOST_RepRap_extruder).

Please note that although this remix is based on two proven designs it has not yet been tested in a real machine.