Rotating 3D printing

The idea is to use a 5th stepper motor and print on a rotating tube.
The maximum print lenght is 280 mm and the maximum diameter is 150 mm.
I used the jaw chuck http://www.thingiverse.com/thing:624625 and http://www.thingiverse.com/thing:5791.
2x profiles 20 x 20 x 500mm and 4 flange bearings 8mm/22mm.

This is still onder construction.
See also http://www.thingiverse.com/thing:1725519 Robot arm 3D printing.