Here are some pictures of the 3D printed frame being assembled for my quadrocopter. The motor mounts were very strong when mounted to the aluminum arms. Additionally, the mounts were designed in such a way that the bolts connecting to the bottom of the motor would be flush against the arm, preventing them from loosening in flight due to vibrations. The central frame was very strong, however, a bit to flexible. It wasn’t the properties of the materials used so much as design flaws which caused the flexing. These problems were addressed and improved in the second revision of the frame, however, printing another frame put my project over budget and I decided to go with a frame constructed from balsa and sheet metal.