Two flashlights without batteries
thingiverse
A compact DC motor (available from AliExpress) with low RPM (60-200) is employed as a generator by rotating its shaft. A high-brightness white LED (100mA) lights up instantly. No light? Try reversing the rotation or swapping the LED leads to the motor. Watch this video for more information: https://youtu.be/BdrUmgwHZN0 The components are combined into one printable file. Would you like a miniature version instead? That's included as well. The LED is soldered directly to the motor, and this combination fits snugly into the housing. https://youtu.be/8U65kBZjey8 For added stability, consider adding a 1000uF capacitor and a resistor in series with the LED.
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