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Spinning Top
A top spins for as long as its mass sits far from the axis. The rim setting is that trade made explicit: a heavy outer ring on a thin web outlasts a solid disc of the same weight.
Drag to spin
As oriented, tip down. Under an hour at 0.2mm.
Set the numbers
46mm
9mm
5mm
Wider rim, longer spin.
2.4mm
The thin disc inside the rim. Keep it light.
26mm
8mm
0
Prints tip-down with no supports.
A splash of paint or a coin epoxied into the rim adds mass exactly where it helps most.