Klein Bottle
thingiverse
Klein bottle is a closed manifold that does not have topside or underside. From any spot on the surface you can walk to the opposite side of the spot without crossing the edge. See https://en.wikipedia.org/wiki/Klein_bottle for details. Please do not dislocate your brain thinking about it!
Download Model from thingiverse
With this file you will be able to print Klein Bottle 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 Klein Bottle.