Lexmark MS331
From the control panel, navigate to:
Settings > > Paper > > Tray Configuration > > Paper Size/Type > > select a paper source
Set the paper size and type.
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