Samsung ML 2550 - Manual (Page 161)

U SING Y OUR P RINTER WITH A M ACINTOSH
A.8
Duplex Printing
You can print on both sides of paper. Before printing in the
duplex mode, decide on which edge you will be binding your
finished document. The binding options are:
Which is the conventional layout used in book binding.
Which is the type often used with calendars.
1 From your Macintosh application, select Print from the File
menu.
2 Select the Duplex.
(Select the Layout if you are an Mac OS 9.x user.)
3 Click Print on Both Sides and select a binding orientation.
4 Click Print and the printer prints on both sides of the paper.
▲ Mac OS 10.2.x