Its an Aerial camera gimbal casing: XL-RCP 24.0 SJCAM M10 series camera gimbal casing.
I design this casing to accommodate my new SJCAM M10+ action camera to bolt into my multi-rotor/quadcopter/drone platform for aerial photography works. The original casing provided by the manufacturer that is compatible for use on multi-rotor/quadcopter or any camera platform attachment was too heavy and tedious to use especially when pushing the button around the camera when its already mounted, plus it has no protection against lens scratches which prone to happen during usage. So the new gimbal casing (XL-RCP 24.0) for SJCAM M10 helps to solve the above problem with some extra features.
For more details and instruction check it at this url:
++ Do take note i'm using Z-modeler to build this 3D parts so would look "cracky" on some 3d viewer but no problem during 3D printing.