Handheld 3-Axis Gimbal For GoPro, Yi, Runcam2 or Rollei410

####Idea and Sources
I made the crossfire2, a 3d-printed quadcopter, which came with a case for the gopro. First I designed a mount for my actioncam, that I owned at that time, the rollei. Then followed a runcam and at last a xiaomi yi.
I redesigned the gimbal to work on three axis instead of two and all worked well.

Than I had the idea, to make a handheld gimbal from those parts and I remembered the rig by Thumber (that I remixed to use it with a smartphone as well).

####Components
A