This is my personal interpretation of various DIY models of GoPro rotor 360 that can be found on internet.
If you own an action cam, a rotor mount, is a interesting way to get spectacular images of yourself while you're trying to produce you some physical damage :-)

I made a mixed design with printed parts and some commercial object ready made that can be found in hardware stores

In the Instruction you can find a part list of them

An example of images that can be obtained is at that youtube link :
Video: https://www.youtube.com/watch?v=JE6s-qFe5bc

3D models of skate helmet and GoPro camera comes from Grabcad
https://grabcad.com/library/skate-helmet
https://grabcad.com/library/gopro-hero-3-hd-camera-with-the-frame