Multifunction printers like the Konica-Minolta Pi3505f provide print, scan, copy and fax services in a single machine. The Pi3505f multifunction device is also capable of printing duplexed or double-sided pages if an additional attachment is installed. To enable duplex printing on this printer model, you will need to access the printer's set-up information through the touch panel located on the front of the printer.
Press "Printer Settings" on the printer's touch panel and select the "Default Set" option.
Press "Print Method."
Press "Enter" again.
Press "Exit." Duplex printing is now enabled.