30 Sided Die d30 Rhombic triacontahedron
thingiverse
I finally stumbled upon a d30 on Thingiverse hidden away under "Versatile Dice", but as one commenter astutely pointed out, the numbers weren't arranged so opposite sides totalled 31. It's a purist thing, and it doesn't affect the randomness of the throw, but I tweaked the OpenSCAD file to "fix" it. The original also had "!9!" for nine and "!6!" for six, and I swapped these out with underscores under the numbers for a more traditional look.
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