If you've ever flown or watched anyone fly a racing drone for any length of time, you know that crashes are just part of the game and propellers are consumables. But what if you could re-use the broken components? RCwithAdam trimmed the damaged parts of a few broken props, and set about designing a 3D printed hub to attach the loose blades together. The hubs were designed let the individual blades to move, and folding out as the motors spin up, similar to the props on many photography drones.