Immediately after building my first 3D printer I've wanted to 3D design and print my own quadcopter. It took a while but I finally got around to it. Turns out, it was surprisingly easy and I went from 3D designing to flying in a few hours. It took roughly 1 hour to design, 1 hour to print, 30 minutes to wire up, aaannnnd roughly 30 seconds of flying to crash and break my frame. I printed out a new frame and due to a transmitter setup error, promptly crashed and broke flight control board, requiring a two week wait for a replacement... I finally got the bugs worked out and have been happily flying since!