Michael,

You're correct. Cura expects the STL files to be created with the scaling set to mm. In the future maybe you can include an option to use scaling mm or inches for STL export if it makes sense.

Thanks,

Pieter

Hi Pieter, yes I can add an option for STL export for scaling it into some specific unit system that you could pick. If you remind me about that again when v4 betas are underway I should be able to add it then.

There is something like an 80 character generic header space in binary STLs which I guess those apps must use to communicate some private units information, but it's not part of the official spec to have the header contents change the import process though.

- Michael