yeah.. I want your printer GP
I print on my desktop A4 printer (about letter size) - or sometimes manages to get a friend who has an A3 laser printer on his job to do my printing... Had my own A3 printer some years ago, but when it broke I never got around to buy a new, they are a bit expensive.
I use photoshop to print from, mostly because I love the program but also because I'm certain I can setup the print so it doesn't scale it down making 1 inch squares smaller to "fit the paper"