3FPD-Replicator 2X - Extruder Upgrade - REV3

This is an extruder upgrade designed specifically for the Replicator 2X similar to whpthomas, and others, but with improvements. -base is fully printable without supports(REV3=DESIGN TWEAKS) -arm is printable with only external supports (bearing slot) -arm integrates feed tube mount as well(REV3=DESIGN TWEAKS) -tension spring geometry improved (REV3=MORE TENSION) -use 5/32" and 1/4" bits for tight clearance bearing/arm pivot holes -uses Makerbot hardware kit for Rep2 + 1 e