print spoolers typically consume space in /var/ for the files being printed and then stream them to the device through the output filters. The amount of data in play to render a page is not typically that big. Yes, there are corner cases analogous to a zip bomb which can make the print model explode. No, in practice this isn't very normal: printing is one of the spaces where compression of the data is entirely normal. "please print another row of black, where black is that thing I told you before, do that 2048 times and then come back"