Mimsy
You need to look into Pen Tables. You can create a pen table for printing that is
all black and white and assign it when you place your drawing on the layout sheet.
If you have a pen table that you like (weights and colors) you can make a copy of it
and over ride the colors to be black, don't over ride the pen 91 as that is the white
background pen if you started with one of the AC pen sets. If you are using a grey
pen for background of any of your fills, you will need to make that white as well for
printing.
David
AC 19-26 Windows 10 64 bit, Dell Prercision 7820, Xeon Silver 2414R ( 12 Cores), 64 GB Ram, Quadro RTX 4000 8GB