Bachmann Klein Bottle

While it's not the usual representation, it's topologically equivalent! (And almost fits on your finger too!)

Made as a statement to the other Klein Bottles on Thingiverse that there are formulas for these things which aren't quite as rotund. I originally planned to have the Klein Bottle itself on here but realized that
(1) it's a surface, which would require it to be thickened, which is something Mathematica doesn't to on export (plus inside-outside problem)
(2) Skeinforge might throw up