the invention relates to a molded cartridge body including a substantially one - piece molded polymeric structure defining two or more ink cartridge positions and being removably mountable on a printer carriage . the molded cartridge body has a front panel member opposite a back panel member , side panel members connected to the front and back panel members and a bottom panel member having an ink cartridge side and a printhead side which is connected to a lower edge of each of the front , back and side panel members , the front , back , side and bottom panel members defining an open - ended cavity . the open - ended cavity contains an ink chamber for each of the ink cartridges , each of the ink chambers being in flow communication with a printhead attached to a printhead location on the cartridge body . a needle panel member containing an ink needle for each of the ink chambers is provided , the panel member being attached to the ink chambers so as to define closed ink chambers . filter elements are disposed in each of the ink chambers between the panel members and the cavities for filtering ink to the printheads . the components of the ink cartridge body promote easy assembly of critical parts and improved yield of useable parts .