Stand Alone Generator Module - Axial Flux, Serpentine Coil
You can find a video on this at https://youtu.be/lK1ZM9WIBh4
to finish this you will need 36 x 10mm by 2mm neodymium magnets, 2 x 22mmOD 8mm ID 7mm thick skater bearings, 50mm of 8mm steel bar.and some enameled copper wire 0.1mm to 0.2mm thick depending on number of turns you want to put on