When a post is printed, the question and answers are printed, but the comments on them are not. It would be nice if the comments were also printed.
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By default only the first 5 comments are shown, and I think that's enough.
Personally, I would hate to see a lengthy list of comments most of time when printing a question. If there are any comments that are relevant to the question or answer they're likely to be voted up and show anyway. If you're printing precisely because you want all those comments, then it's easy to expand the comment list before printing. Conversely, if we were to print all comments by default it would be much more difficult to hide them for those who don't want them.
If you want to print the question with all the answers and all the comments in one single printer-friendly page, check out StackPrinter.