Well, guess what? It saves your print job to a file instead of actually printing it - uncanny huh? ;)
When you save such a file, it's a PRN file.
Well, that was kinda supposed to be funny, but the serious part of this post is that there's a utility out there that will let you print those otherwise useless little files. It's called PrintFile and you can get it here:
Make a note of this, cos one day you'll be like - heh, I can't access the printer, but I know, I can save it to a file and print it off later (on another computer) with that cool little utility PrintFile.
And by the way PrintFile is free. How about that :)
EDIT: also check out EscapeE by RedTitan
NOTE: these apps won't always print your document perfectly! but if you're printer is messed up it could be a life saver.