This is just an idea if PDF combining is laborious with your doc... I have not tried it, but it might be worth a try...
Assuming that
OpenOffice might do a better job than Word for Mac at generating PDFs, and that it should be able to open your .doc file without messing up formatting (verify that)... OOo might be worth a go.
Perhaps someone else has already tried?
Just a few more ideas...
. Save as rtf in Word. Open in TextEdit and if all looks well print from there.
. Save as HTML and send your prof a link
. A stab in the dark... there might be a way to print directly to a PostScript file (install a PS print driver first?), to see if PS works better than PDF
. Try PostScript