Lexmark CX421
From the home screen, touch Eco-Settings.
Notes:
Depending on your printer model, do either of the following:
Select a preset setting or customize the settings.
Selecting a preset
Customizing the settings
Touch Save.
Copy two original pages onto both sides of a single sheet of paper to reduce paper and energy consumption.
Print a single‑page copy of a multiple‑page original document to reduce paper and toner consumption.