I wanted a mount for a GoPro on the boom of my Sunfish and decided to print this.
I recommend printing it with the ring lying on its side, which will result in a stronger print, where layer separation will not cause you to lose a GoPro - something that would be costly.
Printed in PETG, 0.2mm layer height using a 0.6mm nozzle.
I used 3.5mm x 12 mm thread forming screws for fastening - https://www.mcmaster.com/catalog/130/3422/96817A326
The author marked this model as their own original creation.