This is a leightweight GoPro frame. The back of the frame is snappable for easy insertion and removal of the camera. Besides this, for the long-run the back can be fixed with four screws. The GoPro'ish holder is attachable on each of the four sides of the frame.
All you need to print is 1x FRONT, 1x BACK, 2x LEG-1, 2x LEG-2, 1x MOUNT-BLOCK and 2x MOUNT-BOOM. For assembly 4x screws 2.5 x 10 mm each for FRONT and BACK and 4x screws 2.5 x 5 mm for the MOUNT are needed.
All parts need a certain amount of infill - at least 30% - to achieve some desired stability due to the screw-mountable design. This applies in particular to the MOUNT-BLOCK and both LEGs.