This is a very useful (and kinda cool looking, if I do say so myself) turtle mode helper for brushless drones. For drones with a bottom slung battery, it is very common for them to flip over on landing. This will protect your VTx antenna and give you success with crash flip/turtle mode. You will almost always end in the same upside-down position (predictability for quick flip), it will keep your rear props off the ground so you can flip back over.
I made about 15 different designs - shark fins, hornet stingers, etc. and this one prints the best in TPU with no support structures (I added a very thin sheet (easily slice away) to keep the print head from having to retract, and to support the top so you can just let it rip). This design prints the best, and works the best as well. The design keeps the weight down and even provides a super duper handy dandy carrying handle for you quad, hehheh. Enjoy, -[VRMan3D]-