. . . . . . "A first and second ink cartridge, of which only the tips 141 and 145 are shown, are fixedly secured within the barrel106 such that the tips 141 and 145 protrude from the barrel 106 and are not retractable.The housings 5 and 105 are preferably formed from molded plastic but may be formed from a wide range of materials and processes including metal, wood or composites." .