I don't print it out, I make a txt then pdb file and load it on my iphone as an ebook to read at leisure. Well, no actually I then dash off and read it in one go like a starving person!
So as long as I know it's posted the site doesn't matter. AO3's good though as you can make a multi-chapter thing all in 1 if you want - easier to do a select-all.