This is a mount for the Eken H9/H9R action camera. It has a 30 degree tilt and fit the screw holes of the top plate of the martian II 220 frame. It might also fit the other martian frames but I haven't tried.
It also features a bracket in the back to stop the battery from sliding in crashes.
I designed it to be as easy to print as possible and it requires very little support.
I have had very good results printing on a CTC dual extruder (makerbot X2 clone) with these settings. Infill can be turned way up for a sturdier result but 20% is really strong and light weight.