(updated. Added 30mm drills version 17/03/2013)
This is an "interface" between the Prusa i3 x-carriage and the Jonas-Gregs-Wade famous Extruder.
It is inspired on the PrintrBot mount.
This thing is designed using OOML ( http://iearobotics.com/oomlwiki ). If you want to print it just download and print the STL.
If you want to modify it install the OOML (instructions on the wiki) and compile using cmake or your favorite build tool
Source code of this and other things can be found in http://github.com/avalero/3dthings