Razor Planetary Gear Fidget: planetary gear train with non-circular gears! This piece of kinetic art features a 6-sided sun gear, six 3-sided planetary gears, all held within the 12-sided space of the annular gear. Note that holding one planetary gear fixed produces curious motion- although the other planetary gears move they do not spin about their axes (3 pointing up and 3 pointing down). An amazing 3D print design by Graham Watson that produces a fully assembled device with trapped components

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