gopro buoyant handle

I designed this handle in order not to worry about my GoPro-like camera (in my case Forever SC-400 PLUS) sinking into the sea, as well as being able to use it in scuba diving. The mount uses M5 screw as well as a regular knob to secure the case. The only non-printable part is the seal between the screw at the bottom and the handle. When snorkeling, inside of the handle should be empty in order to preserve buoyancy, but when scuba-diving should be filled with water to prevent damaging by pressure