I have a Brother HL-2280DW black & white laser printer. I try to save paper by printing duplex when I can. But sometimes the pages are on separate PDFs or image files. I know I can use some free software like pdfsam but when I just need to print it out, I don't care to have a merged PDF. The Brother support web site drove me nuts when I tried to find the information. The short and easy method: 1) print your first page 2) take the printed page out, open the paper tray 3) put the in paper in with the printed side face DOWN [edit: this reversed on me later, what gives? needed to be face UP - please add a comment if you know why it changes], with the top of the printed content toward the rear of the tray. 4) print your second page. You should now have a perfect two-sided page with the words showing from the top down on both sides.