Bachmann Klein Bottle

thingiverse

As a unique representation, this Klein Bottle is topologically equivalent and even fits on your finger! Demonstrating alternative formulas for Klein Bottles on Thingiverse, it was initially planned to feature the bottle itself. However, as it's a surface, requiring thickness and causing issues with Mathematica export and self-intersection complications for Skeinforge, an alternative has been created - a bracelet! Print with support, remove support, and inside support, capture a picture (hide gridded areas if necessary), and marvel at the confusion it creates.