Refer to the instructions below:

1. Select Paper Handling.
    

2. [For Mac OS X 10.3 and 10.4 users]
   Choose Odd numbered pages and print. Turn the paper over and reload it in the tray, and then choose Even numbered pages and print.

   

   
   
   [For Mac OS X 10.5 or later users]
   Choose Odd Only and print. Turn the paper over and reload it in the tray, and then choose Even Only and print.