Additional to my last posting:
The original design of this extruder comes from Adrian Bowyer (first seen on
vimeo), I have just slightly modified it. The extruder body is modified to use a tongue to hold the bowden tube - so eMaker-Huxley and RepRapPro hot-ends should fit without problems (and without any adaptions). The second change to the original design is the screw hole for the idler (idler screw only can be removed, wenn the stepper motor is dismounted).
Greetings
Andy