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I don't have much documentation, but these two precursors have good info:

RichRap's original: http://www.thingiverse.com/thing:20733
Nick's version: http://www.thingiverse.com/thing:249933

Thingiverse has gone funky on me, I can no longer update or edit this thing! We've tried everything, even sending an email to the Thingiverse people...

Universal Paste Extruder for 3D printers
by RichRap
Nicks Universal Paste Extruder Derivative