Greg's Wade Accessible Belt Drive Extruder

**I just uploaded a newer version of this design please check it out first: http://www.thingiverse.com/thing:456025


This is a mash-up of the Greg's Wade extruder and Terawatt Industry's belt drive extruder. It brings the zero backlash advantages of the Terawatt 00str00der design together with a heavy duty, rock solid design.
Video can be found here: http://youtu.be/cY4r6K0P9Qk
2013.12.05 Added 1.75mm filament option
2014.05.30 Corrected belt size