Folding Quad with Removable Gimbal Mount
This project is designed specifically with smaller 3d printers in mind. I made all the parts from my 6x6 Printrbot Simple Metal.
Just need 8 x M4 screws for the folding arms and 8 x m3 for the frame. Everything else locks in with no additional hardware.
To make this simple, the frame is designed to take two 12inch 1/2in booms. Arms will fold perfectly with this setup, and when unfolded, it's a perfect symmetrical quad for easy tuning.
The gimbal Mount and GoPro case can be found here. It's quick release and requires not hardware to mount
http://www.thingiverse.com/thing:636364