Just a simple platform to hold a NEMA17 motor equipped with Whosa Whatsis' MK7 Minimalist Replacement direct drive extruder clamp: http://www.thingiverse.com/thing:15718
RP mk7-extruder-whosawhatsis.scad and mk7-holder.scad. See http://www.thingiverse.com/thing:15718 for the MK7 instructions. Install the assembled NEMA17 onto the platform. Slide a jhead hot end underneath and clamp with a 30mm M3 screw.