Replicator 2X Extruder Drive Block Upgrade

# Makerbot Replicator 2X Extruder Drive Block Upgrade ## UPDATE Jan 30, 2014 New V2 files uploaded. A few minor changes were made that should create stronger parts that require less post-finishing. Also, a remix has been created based on user comments to create a version that uses an M4 flat head screw to mount the bearing. If you would prefer to use a screw, you can find that version here: http://www.thingiverse.com/thing:237554 ## Intro: This is hopefully the last extruder drive block upgrade you'll ever need for your Makerbot Replicator 2X. It is loosely based on the function of the official Replicator 2 (not 2X) upgrade: http://www.thingiverse.com/thing:53125 and on the aesthetics of the whpthomas upgrade: http://www.thingiverse.com/thing:79807 ## Advantages over other drive block upgrades: 1. Includes a fully surrounded lower filament guide hole between the drive gear and the entry to the hot end. This is *ABSOLUTELY ESSENTIAL* when printing with