This is an intriguing mathematical shape you can print. It has the following features --

• Nice to handle, all rounded surfaces
• Three holes! Where do they go?
• You can stick your finger in, go on, I know you want to.

This is a collaborative effort with a friend, and is based heavily on the instructions here --

[https://www.math.univ-toulouse.fr/~cheritat/boy-surface/index.html](https://www.math.univ-toulouse.fr/~cheritat/boy-surface/index.html)

Note that this page does have STL files at the bottom, but this model is not those. It has be recreated from scratch.

Printing

Unfortunately this is a fairly complicated print, as the surfaces are constantly changing. However, with automatic tree support enabled, as it is in the profile, it does print OK.

Usage and Assembly

Simply print it, remove the support and admire it. It doesn't really do anything.

Safety, Liability and Distribution Rights
I do not accept any liability for the use or misuse of this item. No guarantee or warranty is expressed or implied. You are responsible for any compliance, maintenance and safety. If you do not wholly accept all risks yourself, do not use this item.

This is free to use for non-commercial purposes (licensed under Creative Commons – Attribution – Non-Commercial – Share Alike).

Final Thoughts

• I have other designs uploaded too, so please check out my other stuff!
• Please leave a like & comment if you think this is cool, thanks!
• If you really like it, I very much appreciate a boost.