extending between the inlet outlet orifices 128 130 the first inlet outlet orifice 128 provides access to the interior of the backpressure chamber 112 while the second inlet outlet orifice 130 provides access to the interior of the free ink chamber 114 because the continuous seal 127 between the polymer film 126 and the exterior wall 124 surrounds both inlet outlet orifices 128 130 fluid communication is provided between the inlet outlet orifices 128 130 the optional depressions 125 may also facilitate or improve fluid communication between the inlet outlet orifices 128 130 after the film 126 is sealed over the exterior wall 124 such depressions 125 could possibly allow the film 126 to be sealed across the exterior wall 39 s flat surface thereby allowing for lesser precision in the sealing operation or the depressions could be used in addition to the surrounding seal 127 the backpressure chamber 112 acts as a holding area for ink prior to the ink egressing through an outlet orifice 132 four vertical walls 116 124 140 142 a floor 136 and a top lid 138 define the interior region of the backpressure chamber 112 the interior region is majority occupied by one or more backpressure mediums not shown that are in communication with a vent 144 formed through the top.