suitable conduit 64 leading to a remote reservoir not shown of printing ink is connected to the other end of the rod 56 by an appropriate fitting 66 threadedly engaged with the nut 59 thus the rods 56 serve to align the array of plates and simultaneously serve to provide a manifold to supply ink to each of the cavities 26 viewing fig3 a first channel 68 is seen to connect the conduit 64 with the cavity 26 and is shown to be necked down so as to also serve as a restrictor to assure the necessary back pressure to enable the ejection of a droplet of ink from a nozzle 32 with continuing reference to fig3 a second channel 70 is associated with each cavity 26 and is seen to extend from the cavity 26 to the lowermost portion of the plate 24 typically but not intended to be restrictive of the invention each second channel may have a depth of 0 008 inches and taper from a wide region at the cavity 24 to a restricted region having an approximate width of 0 010 inches at the lowermost edge of the cavity plate 24 this then would result in a rectangular opening at the base of the plate 24 having dimensions of 0 008 inches by.