Where is the Auto 2-sided(Duplex) setting option in the Mac OS X 10.3 driver or greater?

Refer to the instructions below:

Select "Print" from the "File" menu and open the "Print" dialogue.
Select the "Layout" option in the "Presets" section.
You will find "Two Sided Printing" option. Select this option if you wish to print using the Auto 2-sided(Duplex) option.

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