printing to true scale A4 paper

How do I print a closed curve on my 600 DPI Brother HL-1211W laser printer with true scale in millimeters? My Windows 10 DPI seems to be 120. My code is as follows:

fig = figure();

fig.Units = 'centimeters';

fig.PaperType = 'a4';

fig.PaperUnits = 'centimeters';

fig.PaperPositionMode = 'manual';

plot(g1(:,1),g1(:,2))

grid on

It does not produce a true scale print out. Please help.