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Most of the components didn't take very long to model, but we usually had to make multiple revisions. A good example was the pulley wheels, which needed to mesh with the grooves in the timing belt, because any slip would cause the four bar motion to be out of phase. Knowing that it would take a few iterations, we tested some very narrow spokes to same decrease printing time, and they proved very strong - we probably could have also used 3 spokes instead of 5.
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