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SummaryThwack the ball and it vibrates over the magnets, producing an electric voltage and current through the LED that is not strong enough to light it (darn!). However I feel that with a few improvements this thing can produce light. If so I can see it or similar geometries that do generator (ciol moving in magnetic field) action making lights on the tassles of a traditional Mexican jacket or chains on as accent pieces on Full Metal Jackets, lol, to name just two applications. Could light your printer bed on it's own motion, as the original idea went. But it needs work! more coils, more motion for longer time, and 3d printed Iron core for the thwackee. I'll be working on it maybe in time, feel free to do so yourself. Les