T6 / Y6 hexacopter

Check out the whole "T" copter family:
- [TX8 Octocopter](http://www.thingiverse.com/thing:753840)
- [T6 Hexacopter](http://www.thingiverse.com/thing:246350)
- [T4 Quadcopter (10" props)](http://www.thingiverse.com/thing:261145)
- [T4 Quadcopter Mini 315 (7-8" props)](http://www.thingiverse.com/thing:408363)
- [T4 Quadcopter Mini 250 (5" props)](http://www.thingiverse.com/thing:304237)
- [Tubular Crossfire 2 quadcopter](http://www.thingiverse.com/thing:261298)
I've added a post on the [forums over at DIY Drones](http://diydrones.com/forum/topics/3d-printed-t4-and-t6) for discussing and improving these designs.

###Features:

- completely 3D printable (without support)
- simple assembly
- coaxial design (2 motors per arm) provides redundancy to keep flying in case of an ESC, motor, or prop failure
- strong braced tube section arms with plenty of room to conceal motor wiring
- designed for dual (3S) batteries located right in the center of r