3FPD-Replicator 2X - Extruder Upgrade

This is an extruder upgrade designed specifically for the Replicator 2X similar to whpthomas, and others, but with improvements. *** update *** Rev 3 http://www.thingiverse.com/thing:111711 -base is fully printable without supports -arm is printable with only external supports (bearing slot) -arm integrates feed tube mount as well -tension spring geometry improved -use 5/32" and 1/4" bits for tight clearance bearing/arm pivot holes -uses Makerbot hardware kit for Rep2 + 1 extrude