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The problem lies in Fusion 360. If you export using file export as .3mf then the refinement (poly count) is set to low. Thus it creates a low-quality circle. If you export through the mesh tab, select 32d print and make sure the refinement is high then it exports a nice-looking perfect circle.


STL is unit-less, but everything that cares about units will pick one. Typically, the unit picked is mm. But even if that's not the case, you can always scale it with a unit conversion ratio after importing it.

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