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How to export from Blender for 3D printing

First select Scene Properties (the cone and sphere icon) and set length to Millimeters

File > Export > Stl (.stl)

On the right hand side there is a header Transform and underneath Scale, set it to 1000. I don't know if it's necessary to check Scene Unit but I do, and things work!

That's it, click Export STL and import it into your favorite slicer