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Three Sided Die

The reason for the die rolling weird isn't actually something I can control; TTS uses physics for a d6, so it's always going land as though it had 6 sides. They mention this in the page where they explain how to import models. That being said, they should hopefully have that fixed in the upcoming months and it should roll as expected.
Thanks for the comment!

The die tends to land on the end or on the flat surface of one of the sides too often. Solutions might be to make the three individual pieces triangular rather than square, so it can't land on the outer surface, and to make the ends slightly more pointy so it can't stand on them easily.

Suggestion for when you do get the model working - add a bit of color to the number grooves so it's easier to read.

I've been trying to figure out how to add models via tabletop simulator since it wasn't explicitly clear, and I haven't had a chance to triangulate the mesh yet because I've been busy with work-- expect this to be cleared up within the next week or so, thanks :)

umm.. this mod appears to be empty.