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Wow, interesting. Too bad my skills with blender are so low... but it would be interesting to try drawing some differential manifolds.
Ah, Shapeways. Back when I was implementing computational geometry algorithms, I stumbled upon and ordered Schönhardt polyhedron in bronze from them (https://en.wikipedia.org/wiki/Schönhardt_polyhedron). Made the model myself (extremely simple).

Got an email from them about they couldn't being able to polish it nicely due to sharp angles and asked if I would accept their "best effort"; photos were attached. Fully aware of how "mischievous" I've been, I accepted the model as is. Still have it as a memory on my shelf :D