About this 3D model
This is an adapter to mount a BeStable SteadyGo 3 gimbal to a 3DR Y6 drone. It should work on the 3DR quad and X8 as well since the mounting pattern is the same. I only have the one gimbal so I don't know if it fits others but I would imagine it wouldn't be hard to make it work. I used ABS but any stiff plastic should work.