Reprap Wilson Extruder files 
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The Extruder files, including the X carriage, came originally from the Prusa i3 Rework by eMotion-Tech

Those works are in turn derived from earlier designs by ch1t0, afaik.

I have modified the body of the extruder to translate the motor 5MM toward -X to accomodate the herringbone gears, which I generated from a modified version of the herringbone script by ScribbleJ.

** The gear ratio for the herringbone gears is 37/13, which will necessitate a change to your firmware!