Greg's Hinged Accessible Extruder

If you're looking at this, you probably really want this version that has better access for cleaning the hobb and also a guide for the filament integrated with the idler:
http://www.thingiverse.com/thing:17030

If you are interested in the stages of development, read on for the details of this version:

This is an update to my Accessible Wade's Extruder.

The idler is now hinged using an M3 screw.
I have also added support for the central part of the 608 idler so that there is no need to