I once had a decent printer that printed color, now... it doesn't anymore. It went dry... so its just black and white. I recently got a new printer that prints color and photos and is really awesome. So what I'd like to know is how often do I have to print in color (like 1 time a week or something?) to make sure they never go dry? (cheaper to keep em wet so I don't replace cartriges and only ink). 