I found the answer to this in another post. To set the scale factor to go from inches -->> MM the value is 1/25.4 = 0.03937 The difficulty is that the GUI preferences dialog doesn't have that many decimal places. So you have to open: Tools --> Edit Parameters, and then go to "base-app, preferen...

I didn't see this anywhere else, so I thought I would tack this on here - some notes on my recent experience trying to import DXF in inch units: I made some 2D plans and elevations on Autocad 2016. When trying to import the files to Freecad, I could not get the ODA converter to work properly (some e...