N_struder REV 0.1

I call this thing the N_struder. With this revision being an N = 2struder. The original design intent was to hack http://www.thingiverse.com/jag awesome http://www.thingiverse.com/thing:7113 for use with my cupcake, but after seeing Makerbot's MK7 I ended up taking it to a whole new level.

Design Concepts:
Cooling Fan: I mostly wanted to use parts and stock I have laying around my shop. The idea with the location of the heatsink is to cool the stepper motor (while still using a MK3 geared DC motor I noticed after long builds the filament would strip). I fixed this with a vacuum pump blowing air right on the hobbed drive, keeping the motor cool to the touch (a terrible solution), but it worked.

With this location it also allows for any cooling fan to be attached. I think it is important to have a large heatsink, like a CPU fan when using multiple extruder heads. I imagine 100W+ possibly which is in the range for a CPU fan (plus they are often found FREE!)

Filament Drive/ Mate