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In 2.79 with my scene units set to millimeters and Unit Scale set to 0.001 I never had a problem, now with 2.8 I need to change the scale at export to 1000 to get a correct size model after importing into software that cares about scale, namely my 3D printing slicer. From what I understand, Unit Scale in the Scene properties only changes the reporting of the units now.

I've tried all manner of combinations to get the reported units to marry up with the exported size without having to scale on export but with no luck.

Is there a way to setup the scene so that I don't have to scale at export, or is this something I just have to live with??

Thanks

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I just started using Blender, this drove me nuts. After messing around with Blender settings to work in cm I just reverted back to using meter. I made a cube 10 m square, exported an STL with no scaling and was able to load in a perfect 10 mm cube into simplify3D, so it seems just setting blender to metric meters and treating meters as mm will work.

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  • $\begingroup$ Thanks Jeff. See my answer below. I hope it helps you too! $\endgroup$ – Ash Jun 10 at 4:02
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I actually figured this out.

You need to set your scene to metric, use millimeters as the length, and here's the critical part, set the scene units to 0.001

This makes all the units display as millimeters and the scaling in exports correct as well. It also makes the units in things like modifiers and textures and everything else make a lot more sense, instead of having to use ridiculously small or large numbers in in something like the settings for a displacement modifiers texture. It also helps the sliders be more controllable.

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