The file 'Hextuple Klein Bottle 3D Printer Model' is (stl) file type, size is 25.6MB.
This is an expansion of the regular mathematical Klein Bottle: https://en.wikipedia.org/wiki/Klein_bottle
The bad news is that it takes a long time to print, the good news is that it prints without supports.
See video here: https://youtu.be/Zcb6E3u87QM
Hextuple_Klein_Bottle.stl | 47.0MB |