From NuGOwiki
Printers
If you use the default skin ("Monobook"), MediaWiki uses Cascading Style Sheets in order to specify the style and layout of the printable version of a page. In modern browsers, the print function of the browser should automatically select this style sheet when you print an article -- hence the "Print" command of your web browser is normally all you need to know.
If you are using other, older skins such as the "Standard" skin, you can get a printable version of a page using the "Printable version" link, or by adding the text "&printable=yes" to the URL.
You create a URL to the printable version of the current page with:
{{SERVER}}{{localurl:{{PAGENAME}}|printable=yes}}
which displays:
http://www.nugowiki.org/index.php?title=Printable&printable=yes