Open the Curator Print Server. 

Next to 'Printer' select Sinfonia as your printer as shown below:

Click the gearbox icon next to the drop-down menu and the Printer Properties window will open as shown below:

Click on 'Preferences' button to get the Window below:

Select Print Size to be 4x6 split. Click 'Apply' and 'OK'

Your printer will now cut the paper as photo strips instead of full 4x6 sheets.