The ink level machanism in the 3000 is not like the smaller cart machines. It's more like your car's gas gauge; it actully measures how much fuel in the tank, not how many miles since you last filled up. So if you don't fill all the way up it still works. So this makes swapping carts easy, but they have to be the same type of carts, or the ink reservoir issue kicks in! C. David Tobie Design Cooperative CDTobie@designcoop.com - Please: Stay on topic. Trim quoted messages. http://www.leben.com/lists for list instructions.