Auto duplex printing is a feature that allows a printer to automatically print on both sides of a sheet of paper without the need for manual intervention. This feature saves time, effort, and paper, and can also reduce printing costs. Auto duplex printing is available on many newer printers, but some older models may require manual flipping of the pages to print on both sides. To set up auto duplex printing, users need to load paper into the input tray for the entire job, open the document, click File, and press Print. According to the Environmental Protection Agency, automatic duplexing can save between 30-50% of paper costs.