Simple little thing, a Pachinko ball trapped in a printed cage. Any similar sized ball should do, 9mm-12mm or maybe a little bigger range.

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FlashForge

No

No

.2mm (Medium)

10%

Well, I guess you'll have to figure out how to get the ball in there!

Hint, don't smash it between the extruder heater and the cage bottom! The nozzle's not the only thing hanging down there!

I was a little worried about the overhang w/o supports, but it's small enough that Simplify3D and my FlashForge did OK.