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Why STL? I'd wager OBJ is a much more common interchange format for 3D models.

OBJ is for 3D graphics, STL is for 3D manufacturing.

Though it's trial to convert between them sans color loss from OBJ to STL 1.0

Wasn't really my point.

Well, github is targeting users of 3D printers, not game/graphics developers.

We grabbed a 3D printer for the office a while ago.