When printing in CAD, you need to fill the printing area with the color you want. I think the effect is not good. I used the method of printing multiple times in the past, and the effect was very good. That is to first fill a piece of the drawing. Fill it with the color you want, then put the paper in the printer to print the background color first, and then put the paper back to print the drawing. You can also print signatures, seals, etc. The order cannot be reversed. Print the background first, then the drawing. Finally, the stamp is printed and the drawing looks very real.