Daniel described a process using this site:
The problem for me with this and similar sites is that you get a pdf file that's native size is much bigger than most printers will handle --- so you either reduce image size to too-low or you print on multiple pages. Or do a more complicated process like it sounds like Daniel is using to piece together what you want and then drive to a local kinkos or the like to actually print it.
That's way too much effort for me. For the local outdoor group that I volunteer with, a few of us analyzed this process and the result was the link I shared before,
The first option we listed there gives an approache that allows you to print out desired topo map chunks at decent resolution from your own printer, and without using any additional tools or a very complicated process. I.e., non-geeks can manage it just fine. I suggest that folks try this as at least their first option before deciding that they might want something more complicated.
Certainly a knowledge of more tools and choices gives you more options to control exactly what you get for the, I suspect, < 10% out there that really want that. Maybe well under 10% as I'm a somewhat geeky guy and the simple approach does me just fine in almost all cases.