MiniBnz's Triple extruder (Q48690)

here is my solid works (edrawing) files for my extruder, its not finished yet i need to add the motors but you can get the idea of how it works and please improve on it, make it printable :) three spring loaded arms apply grip to the filaments as a camshaft releases each arm at 90' intervals. more of a write up here http://minibnzreprap.blogspot.com/