What I do is copying the Q&A to a Word document, rearrange it as needed (if needed), and then print it. Is this the best way possible? How to easily and efficiently get a printable version?
Why don't you try an Ad-on for that. There is a Firefox Ad-on called Print Edit.
Allows editing of web page content while in Print Preview mode, prior to printing or saving as HTML or PDF.
Compacts the layout and removes unwanted content such as adverts, sidebars and blank pages. Any element can be formatted, hidden or deleted.
I've just tried it for couple of Q+As on DA. It's working good.