No, but I did do a project about how children kick footballs. Young kids can injure their bones and joints by kicking balls which are too big for them. We went to a school and did a lot of tests to see how far kids could kick balls.
Never, but im sure i could give 3d printing one a go! It wont be very comfortable & i doubt you could walk in it, yet alone run but in theory i could make one.
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