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 use washers to space the bearing away from the plastic.
I have been using this design for a while now and love it.
Changing filament is a simple as compressing the spring then whipping out the old filament and poking the new one in.
UPDATE: 6 Aug 2011 - Add arcol (cory75 thing:10532) and wildseyed hotend mount options. Im not overly happy with the asymmetry of the arcol option.