Select the original you want to print.
Select [Print...] on the [File] menu.
Select [Printer Features] in the pop-up menu.
Select [Paper] in [Feature Sets:].
The item names in [Feature Sets:] differ depending on the version of Mac OS X you are using.
Select the paper type you want to use in the [Paper Type:] pop-up menu.
Select the paper tray loaded with the selected paper type in the [Paper Feed] pop-up menu.
Print the original using the print function in the default application of the original.