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Just brainstorming here but I don't think they need to be particularly precise or strong. You can likely use many materials as long as you can get enough weight (lead weights?) on the circumference. E.g. 3d print the flywheel structure (can be made thicker for rigidity if that's an issue) and glue some lead weights on. Looks like you can have slightly larger wheels too.

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I spent quite some time (almost) perfectly aligning my reaction wheels. Vibrations at multiple thousands of RPMs are no joke. Then again, such speeds are typically unnecessary once the cube has settled into its equilibrium position. ReM-RC on YouTube has built a similar cube which uses 3D-printed wheels with steel bolts in the circumference [1].

My wheels are oversized when you just consider the balancing application, but I want to add jump-up functionality later, and the wheels need significant inertia (and also need to run at significant speeds) to accomplish that.

[1] https://youtu.be/AJQZFHJzwt4

Cool. The 3d printed wheels presumably would have some dampening properties vs. the steel ones. You can also attempt to balance them at speed (moving/adding/removing the weights) to try and minimize vibrations like you do with motorcycle or car wheels (I guess there's multiple modes though).

Fun project!

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