The ZipTier - fully 3d printed quadcopter

This is my design of very simple, and durable quad-copter frame. It consist of multiplication of only four parts joined together with several of zip-ties. It is designed for 12'' propellers. You can see my configuration of motors/battery on one picture from e-calc site. My measured mixed time flight is 13minutes. Weight of 1560g is with FPV set. You are very welcome to do your own configuration and share it in comments.Flight video http://youtu.be/vphSI89p5hg