Modular mounting system using plastic or aluminum tubes for the longer parts.

Easy to customize by simply changing the tube length. Fully compatible with most of the typical GoPro mounting stuff.

BOM:

Plastic or Aluminum tube 15,5 mm (Hardware store)

M5x20 mm Screws and Nuts for the joints or GoPro Screws

M5x8 Screws for the revolving joint between the tube adapter and the GoPro mount

Used it for some of my other things: https://www.thingiverse.com/thing:4110754

and https://www.thingiverse.com/thing:4110594

Others will follow shortly.