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I want to start with attributions to the inspiration of this extruder to keesj for http://www.thingiverse.com/thing:181833.
This is a major work in progress. Plunger style paste extruder. I thought I would throw this on here and see if anyone else wants to play. The tolerances of the parts are very close. Requires a well calibrated machine. Designed to fit a 10cc syringe, future plans for bigger capacity.
The plunger mechanism is designed to hold the injection molded printrbot extruder gears. I have not had time to test the torque. I will update when I figure this out.