Mobius Ball
thingiverse
I've got something that might be useful for modeling, and it's actually pretty versatile when you think about it. Just takes a bit of finesse to get it printed out right, but the skilled among you should have no problem with it.
Download Model from thingiverse
With this file you will be able to print Mobius Ball with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Mobius Ball.