Lexmark MX432
The trays automatically detect the size of plain paper. For specialty media like labels, card stock, or envelopes, do the following:
From the home screen, touch Settings > Paper > Tray Configuration > Paper Size/Type > select a paper source.
Set the size and type of the specialty media.
Adjusting the guides when loading paper and specialty media on the multipurpose feeder can result in trouble‑free printing.
Lexmark MX/MSx31, B3340, B/MB3442, and XM/M1342: Paper Curls when Exiting the Output Bin