and the "Designing mechanical parts" series at the end of the page. 0.6 mm should be ok for White, Strong & Flexible for the minimum space, but it depends on the form. I was lucky with my model with 0.5 mm clearance:
I think for a chain even less space could work, because there is not as much contact area as with hinges. But if you don't need minimum space, use some safety margin, e.g. 2 mm.
I don't know for metal, maybe it needs a bit more.
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