My new extruder
The old one was hard to use, with the idler to the inside. I printed the Prusa version of the Eckstruder by Eckertech, http://www.thingiverse.com/thing:27322 with my herringbone gears for it http://www.thingiverse.com/thing:57510
Great improvement. I can now retract filament at 50mm/s, improving prints quite a lot in terms of ooze prevention.
Of course, a nice new extruder needs to be celebrated… with the obligatory Spool holder – mounted right below the extruder.