Drone/Quadcopter frame – Arduino drone – Ludwik Drone

This is a frame that I made about a year ago, I don’t recommend printing it, because it is not super strong. Maybe it would help someone to design his own frame and create something new. This one works, but during the development of my Arduino drone – Ludwik Drone I broke it about 7 times and I switched to a different frame. I decided to share those files online because someone may find it useful.
Here is a link to instructable about this project:
http://www.instructables.com/id/Arduino-Drone-Quadcopter-3D-Printed/