In the top left of the screen click the Apple icon. Click System Preferences. Click Print & Fax. Select your HP printer and click Options & Supplies. Click the Driver tab. Tick the ‘HP Two-sided Printing Accessory ‘Duplexer’ box. Now in Word (or other program of choice) when the print options come up, click the… Continue reading How to enable duplex printing for HP Photosmart printers on Mac