OS X.2 (C5400n)
1.Activate Print Center from Local Hard Drive →Applications → Utilities →Print Center.
2.Highlight the printer name and select from the menu Printers → Show Info.
3.Click the box next to Duplex.
4.Click Apply Changes and exit to the desktop.
Setting Duplexing as the Printing Default on the Macintosh
OS Classic
If you will always utilize duplex printing:
1.Access the printer driver via an application (File →Print).
2.Select Layout in the drop down menu at the left.
3.Click the box to enable Print on Both Sides.
4.Select the desired binding position and make any other adjustments desired.
5.Click Save Settings.
OS X
If you will always utilize duplex printing:
1.Access the printer driver via an application (File →Print).
2.Select Duplex in the drop down menu at the left.
3.Click the box to enable Print on Both Sides.
4.Select the desired binding position and make any other adjustments desired.
5.Save your printer profile preset with a descriptive name, e.g. Duplex Enabled.