Duplex printing refers to printing on both sides of paper. This saves paper and makes large prints more manageable, but does not save you printing costs. For instance, a 30 page print will print duplex on each side of 15 pages of paper, but cost $0.07 per SIDE to print (or 30 x 0.07, the same as printing 30 single-sided pages).
Most public lab printers are capable of duplex printing, but to save printer wear and tear, it is not generally enabled by default.
There are two ways to set duplex printing:
Setting Duplex Printing for your Entire Session:
If you want to set the printer to automatically print duplex for you, you must do so every time you log into a computer. Once logged in, WAIT for your printers to connect. To see their progress, go to "Start Menu" -> "Devices and Printers". Once the printer you are interested in appears, right-click on it and choose "Printing preferences" from its context menu.
The "Printing preferences" dialog will appear (below is an example from a Dell printer, though your experience may vary slightly). On the first ("Layout") tab, set the item under "Print on Both Sides (Duplex)" to "Print on both sides". Ensure the "Long edge" item is selected below it:
Click "OK" to save these settings. Now, whenever you print anything, it will automatically duplex it.
Setting a Particular Print for Duplex:
A quick way to set for duplex if you are only printing one or two different things is to set it just before you print, from within whatever application you are using. As an example, in Microsoft Word 2013, before clicking the "Print" button, set it to "Print on Both Sides":
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