you cant build a motorbike and make it fly with it without some changes !!
You would have to build something to get this working, you could however create a php page that takes the page name (as variable) you want to show as printer friendly, and either query the DB for the content or call the page and extract the content. This depends on how the pages have been coded though.
I built a site with printer friendly and it was achieved with keeping the content seperate from the application layer, then just calling the content if the printer friendly link was hit.