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Cool Thing! I've often thought about using this idea (albeit with ordinary, wound coils) to make a motorized bike/skate wheel. Some thoughts:

What about making a second coil plate (wired in parallel), sandwiching the rotor (sans washers) between them, and (directly) using both ends of the magnets?

If I made this, I would use a proper bearing (e.g. a 608 skate-type). Since magnets will likely not be printable before (proper, metal) bearings, I think its utility would outweigh it's "vitamin-ness" :)

Two words: Halbach array ;)