Adjustable Extruder Drive Block Upgrade for Replicator 2X

The purpose of this design is to enable fine-tuning of the pressure applied to the filament by the idler ball bearing. It is based on these previous things: - http://www.thingiverse.com/thing:136589 - http://www.thingiverse.com/thing:52203. Note: This is not intended to be a replacement for MakerBot's original extruder block! Since the Replicator 2X Desktop 3D printer is suited for power-users who like to experiment, this adjustable extruder block offers an alternative way of gripping the filament and pressure fine-tuning. Please do not attempt to replace your original block if you are not comfortable disassembling your current extruder and fix any issues. If you try this design, make sure to save the original parts and follow the instructions below carefully. - http://bit.ly/1eaYi3p (instructions) Features -------- - All parts can be 3D printed! - Offers step-less filament grip pressure adjustment - Built-in [filament dust filter](http://www.thingiverse.com/thing: