Spherical Halbach magnet array - 3 different sizes
thingiverse
This is a spherical (halbach) magnet array that fits 5mm cube magnets. You can arrange the magnets in a halbach array pattern to get the strongest field. You can also arrange the magnets equally so all poles of the magnets face the same directions or in an alternating north-south pattern. Be creative and find an arrangment pattern that fits your needs the most. The holes for the magnets are 5,1mm large, if you want a thighter fit, just scale the print down a bit.
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