I Roll 20's - easier to print
thingiverse
To get a D20 with "20" on each side, I utilized my blogger status at MakerBot and requested a design from Thingiverse users. Polymaker's solution won the unofficial contest. However, printing several icosahedrons resulted in issues due to extruder snags. Eventually, I tweaked the OpenSCAD design, added a 30mm diameter disc underneath, and set the die 0.25mm above the disc. Support structures were printed, but might have been unnecessary. The flat disc ensured contact with the build surface, allowing easy removal without sanding or threads.
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