So this is a work in progress... just wanted to see if there is interest, as its been pretty labor-intensive. Basically trying to design an easily printable model for War Machine's shoulder-mounted minigun. I'm designing it to be motorized, with the barrels sized to take half-inch pvc, and a 1/4 inch drive shaft and components off sparkfun.com. So far I have most of the gun itself finished and cut into printable parts with press fit and gluable assembly. If you're serious about trying to print this, I'll start loading the .stl files. Just don't want to bother if no one is serious, as there are a lot of parts to make it easily printable. Still lots of work to do on the support arm and back mount.
Message me if you want it :)