All printers located in the 5th floor copy center have the ability to print double-sided or single-sided.
The default is set to single-sided printing. To change to double-sided, start by selecting print as you usually would. In the print dialog box, select the Law Library printer (if there are multiple printers available, look for the one that says "LAW_B&W"). Then click the "Properties" button. Click on the "Printing Shortcuts" tab and select "Yes" for the "Print on Both Sides" Option. Click "OK" and then print as usual.
Note that the cost is still the same (7 cents per page/side), but doubled sided printing will allow you to conserve paper.