Hi Involute, you should be able to accomplish that by switching your units to mm before you do the export. Then either don't save that version or switch it back to continue your work.
I'll try to think about an option like you're asking about, it might be a little tricky since STL files don't have any setting in them for what unit system they are in and I don't want to make it sound like that isn't the case.
- Michael
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