[entwisi]

Some printers have fixed heads and just replaceable Ink "pots" whereas some have them integrated to the cartridge. The former are best for people who print a lot as they dont worry about drying up blocking them and replacement cartidges are cheap, the latter are better for those who print occasionally as a new cartridge replaces the lot, the carts are more expensive obviously but you know that replacing one will give you back full printing again...