To print a postscript file with single-sided printing, edit the
postscript file, and put the following three lines after the first line

%%BeginFeature: *Duplex None
<</Duplex false>> setpagedevice
%%EndFeature

Make sure that the first line still reads

%!PS-Adobe-2.0    (or %!PS-Adobe-3.0)

If you are printing dvi files, create a one-line file whose line is

<</Duplex false>> setpagedevice

I call my file duplex-off. To print a dvi file called filename.dvi:

dvips -h duplex-off filename

Then you do not have to edit the postscript file as above.

Gerald Cliff                     email gcliff@math.ualberta.ca