45 degree Flight Controller Mount
This is to allow mounting a flight controller without it being part of the structural stack.
I used foam tape to tape my FC (RaceFlight Revolt) to the adapter. The little pins are just to aid alignment when putting it down on the foam. I had another design that used holes, screws and o-rings but it was more of a pain. Feel free to tinker the design by following the link below. It's easy enough to tweak.
https://www.tinkercad.com/things/5U8q343WUhm