Well yeah shit. A lot of average people see something like this and think how impressively strong the Lego plastic is. When in reality the choice of metal makes more of a difference between it and the plastic strength. Stainless steel seems over priced in this application. Even a slighlty hardened mild steel with an oxide finish would be fine for most applications. My Construx toys from the 80’s had metal axles, but they used a single groove engagement and a rubber pulley drive system. The metal just allowed the shafts to be small enough to pass through the connectors.
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