The original design of this extruder comes from Adrian Bowyer (first seen on vimeo vimeo.com/54462325), 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, if the stepper motor is dismounted). And I have made a change to the grub hole in the small gear to make the nut retainer a little stronger. If you want to have a look to the original files please visit: github.com/reprappro/Mendel.

Update V2 (3 Feb 2013): assembly instruction added; V2-extruder-block added (moved filament-drive-axis 0.5mm for better fit of hobbed bolt; larger hole for idler screw); deeper hole for motor flange (better motor fitting if your printed bridges are not perfect).
Update (24 March 2013): OpenSCAD sources added (they are not really nice - but better than nothing)

Watch this extruder in action: YouTube ( youtube.com/user/3DAndyAustria ) – there you can find an assembly instruction video also.

Some pictures of the mounted extruder could be found on Flickr ( flickr.com/3d_andy ) - there you can see also the mounting kits for M8 or M6 threaded rods (and of course assembly pictures).

Needed parts to build one extruder-drive:
- 1 of each: extruder-body.stl, small-gear.stl, large-gear.stl, tongue.stl
- 1 M3x5 set screw
- 1 M3x12 bolts
- 2 M3x16 bolts
- 2 M3x30 bolts
- 4 M3 washers
- 4 M3 nuts
- 1 M3 nylock nut
- 3 623ZZ bearings
- 1 hobbed bolt (need one? Find me on eMAKERshop ( emakershop.com/Seller=2273 ) or write a private message on thingiverse)

For mounting the extruder to the top of a Mendel/Prusa (with M8 rods) you will need:
- 2 mendel-mount-front.stl
- 1 mendel-mount-rear.stl
- 3 M3 nuts
- 1 M3x16 bolt
- 2 M3x25 bolts

For mounting the extruder to M6 rods you will need:
- 2 huxley-mount.stl
- 2 M3 nuts
- 2 M3x20 bolts

Good luck!