You can make a kinetic charger using your 3D printer and a little effort.
This allows you to charge your electronic gadgets here and now. Also it would be a good gift for your favorite.
How it works:
25x5x2.5mm NdFeb Magnet 20 pieces
2 pieces Li-ion battery (any up to 3500mA)
8 coils AWG28 (0.32mm)
2 springs for moving blocks
2 springs for battery
I used Form Futura filament for printing the housing.
But you can use ABS or PLA with a good result.
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