Mathematical shape - "Boy's Surface"

This is an intriguing mathematical shape you can print. It has the following features --Nice to handle, all rounded surfacesThree 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 Note that this page does have STL files at the bottom, but this model is not those. It has be recreated from scratch. PrintingUn