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Anyone here know what these are? And if it's possible to make nets for them in Stella 4D?

If you don't know what I'm talking about - google it. Try out a hexa-hexa flexagon for starters.

I remember making flexagons when I was a kid. Stella isn't designed to make those sort of things, although you could probably force it to print their nets if you already knew what the net needed to look like, by augmenting triangular prisms together to make a kind of 3D extrusion of the net, then printing out the net of the top.

Rob.