Greg's Hinged Accessible Extruder
Made by xmw, uploaded
I made some adjustments at the mounting points to fit it on an old RepMan Darwin clone.
The hobbed bolt and other metal parts are from ebay http://www.ebay.de/itm/172631804893 ,
Unfortunately the spring screws are M4 and I had to do some remove some material.
The idler is a guidler from http://www.thingiverse.com/thing:17030 .
I had some filament jams and lost some x/y steps and re-homed.
Maybe it's time for a second print with fixed screw sizes and this reliable extruder ;-)