Thanks. I am aware of what .dxf files are for. I did not say I was trying to 3d print a .dxf I said that I have exported .dxf files from the same software to have things laser cut out of steel plate, and that there were no scaling problems with those parts. But thanks for your input, especially about the filament sizing and how it can affect the finished dimensions/tolerances of the printed part. That is something I had not considered yet. (That the printer can only print a whole filament diameter, and has to + or - a layer if the dimensions of the part are not a whole factor of the filament diameter)