Mett the STEMFIE Infinity Gears project. It is an educational playset containing a set of gears that demonstrate the mechanical principle of gear reduction through six steps. Each module features two gears on one axle: the small gear with 17 teeth and the large gear with 58, resulting in a 3.41 gear reduction.
This project uses a geared electrical TT Motor to drive the array of gears. The power supply uses a standard USB connection that can be connected to a power bank or USB port.
Download the 3D printing files freely, and acquire the TT Motor via this project's page at MakerWorld.
This toy is unsuitable for children under three years due to choking hazards! 
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