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Printrbot Gear Head Extruder - Bowden Mount
Update #1 - It works. Printed it in PLA and then ran a 10 hour print using it. It may not hold up long term... I'll probably re-print in a higher temperature material.
Update #2 - Printed for 50+ hours so far, a little creep in the PLA has caused the extrusion rate to change. Still working though. Updated the design with more support.