I downloaded the extension to convert skp to dxf/stl. I convert 2D objects to make them good for laser cutting. When I view to converted file after, the measurements have changed even though I choose millimeters like when I created the models. When I convert to stl, it reduces size ca 10%. When I convert to dxf, it increases the size ca 20 x.
I did the suggested steps of putting the skp to parallel and top view before converting. I also checked model info, all is in mm.