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Comment on MIT inventor creates cube robots with no external moving parts

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What does everyone think about energy use and storage? Are magnetic devices energy efficient enough for this to work some day?

Maybe they could attach them to an external power supply?

Seems like it could be a constraint that needs to be solved for this to be useful

Energy use seemed like a significant issue - how many flywheel spinups do you get out of a battery?

They could include a charging circuit that routes power through the assembled blocks. Each unit would still require it's own independent power for disconnected motion, but they could recharge when connected.

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