Wireframe Klein Bottle

A [klein bottle](http://en.wikipedia.org/wiki/Klein_bottle) with wireframe style so the whole surface can be seen. With a solid surface the bottle looks not so exciting and the meaning is difficult to understand. So I made this version.
It prints without support, but isn't very easy to print, because it needs a precise calibration and good adhesion on the bed.
Edit: I tested it now with 0.3mm layers and it printed successfully (yellow image).