Magnet Wheels for 1/2 inch circular magnets.
thingiverse
Here is a collection of innovative magnet wheel configurations for 1/2-inch diameter, 1/2-inch long circular magnets. Simply place a single magnet in each 3D part and spin it through carefully crafted magnet wire coils to see firsthand how much electricity they produce. To facilitate this process, I typically mount the parts on 1/4 or 1/2 inch wood dowels before spinning them with a hand drill. These versatile parts were expertly designed using the user-friendly free software package eMachineShop.
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