This is an upright flight controller mount for use in rc airplanes. The flight controller mounts to the flat plate which can be easily removed from the mounting bracket. This allows you to hard mount the bottom portion to your plane and still easily remove your fc with no tools. The plate is held in with friction and is held very securely. The flat plate has the square mounting pattern commonly found in both mini (20mm) and normal sized (30.5mm) flight controllers with built in standoffs. I also made a smaller version of this that only fits the 20mm square mounting pattern.

https://www.thingiverse.com/thing:3122710