Here is my last little project realized using a 3D printer and some manual tools:
I share the files for who would want to make it at home. Nothing prevents to achieve on the 2 scale for who wants something more powerful. Magnets and bearings are found at the 2 scale. For now, I have not yet put all the files under Thingiverse, it lacks the nomenclature, wiring plans, but all that will happen soon. And then there are still 4 episodes before the end of the realization of this generator.
There will later be a multi rotor version (several rotors in parallel) and an encapsulation that will be suitable for the realization of a small wind turbine.
https://www.thingiverse.com/thing:3324923