3DMON's DD Extruder for the E3D Hotend

Here is my DD (Direct Drive) extruder I designed for the E3D hot end.
Mine is attached to an Ordbot but I included a body for 50mm (Mendel style) mount holes too.
A Jhead hot end should work also but I have not tested that.

The extruder was designed in Sketchup and I have included the .skp and .stl files.

Parts needed:
1- The best hobbed extruder gear out there!
1.75mm gear http://www.ultibots.com/micro-extruder-drive-gear-1-75mm-filament/
or 3mm gear http://www.ultibots.com/micr