Bowden Cable Coupling for RepRap

This is only for people who want to print really fast ;)

Its use is shown in this video:
http://www.youtube.com/watch?v=cSBqBW1w2wE

This is the filament drive mechanism end of the Bowden extruder. The same coupling could be used on the other end (the extrusion, or hot end), or a special purpose (smaller) coupling could be designed to fit your specific extruder (one that also clamps the heater insulator).

The idea of turning a nut onto the PTFE tube comes from profounddevices. I really