I would like to make a suggestion for a Stack Overflow/Exchange complete Q&A printer-outer.
It would print out the full question, its answers, and its comments, which the normal web-browser print does not do.
Try stackprinter http://www.stackprinter.com/.
This could be done with the SO static dump framework that I've started to work on. I don't quite have comments rendering yet (I've been busy with other projects), but the rest of the question/answer data is available in a plain format suitable for printing. Adding comments would be pretty straightforward.
This is completed as per https://meta.stackexchange.com/a/329187/235711
Use the print functionality of your favourite web browser? If you are on Windows CTRL+P will work in most cases.