Printer Friendly CSS

Is it possible to target the print version of a specific topic with CSS? For example, if I have one topic that is a manual (ie. not just the first post but the entire topic is the manual, with different posts containing different sections of the manual), I’d like to hide post number, user names and post date (and possibly a few other things) from the print layout.

A workaround seems to be that I put that topic into its own category and then target the category, but maybe there is a better way?