How expensive was it to build this?
-Since we experimented with various techniques on coming up with the best design, we spent around $100. Nevertheless, we predict that one charging shoe would cost $50 (including the shoe).

What is the gear ratio of the gear train you used?

How long did it take to build?
-Our group worked over a period of 10 weeks. However, with a detailed DIY guide and all the components, you can make this over a weekend.

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