Printing scale is set in the Print Preview mode, set it simply to 1:1. And of course set the paper size large enough to accommodate your whole drawing.
Or do you want to get it printed in a large format at a plot service from a dxf file? Then basically it's their job to get the scale right. It helps to draw a page border of the desired format. Or you can provide them a pdf file, so you can make sure the right result.