A layered nozzle structure for extruding a bead of extrusion material from an extrusion printhead assembly onto an upper surface of a target substrate, the layered nozzle structure comprising: a top nozzle plate including a first front edge and defining a first inlet port; a nozzle outlet plate including a second front edge and defining an elongated nozzle channel extending in a predetermined first flow direction from a closed end to an opening defined through said second front edge; and a bottom nozzle plate including a third front edge, wherein the top nozzle plate is mounted on the nozzle outlet plate to form an extrusion nozzle, where a portion of the top nozzle plate forms an upper wall of the extrusion nozzle, opposing edges of the elongated channel form side walls of the extrusion nozzle, and the opening formed in the second front edge defines an outlet orifice of the extrusion nozzle, wherein the first inlet port is aligned with the closed end of the elongated channel, whereby extrusion material forced through the first inlet port flows in the first flow direction along the extrusion nozzle and out of said outlet orifice to form said bead, wherein said layered nozzle structure comprises means for biasing the bead toward the target substrate, and wherein the means for biasing the bead toward the target substrate is formed by the second front edge of the nozzle outlet plate and the third front edge of the bottom nozzle plate being beveled such that the second front edge of the nozzle outlet plate and the third front edge of the bottom nozzle plate are coplanar and define a planar orifice edge that is substantially parallel to the upper surface of the target substrate. a top nozzle plate including a first front edge and defining a first inlet port; a nozzle outlet plate including a second front edge and defining an elongated nozzle channel extending in a predetermined first flow direction from a closed end to an opening defined through said second front edge; and a bottom nozzle plate including a third front edge, wherein the top nozzle plate is mounted on the nozzle outlet plate to form an extrusion nozzle, where a portion of the top nozzle plate forms an upper wall of the extrusion nozzle, opposing edges of the elongated channel form side walls of the extrusion nozzle, and the opening formed in the second front edge defines an outlet orifice of the extrusion nozzle, wherein the first inlet port is aligned with the closed end of the elongated channel, whereby extrusion material forced through the first inlet port flows in the first flow direction along the extrusion nozzle and out of said outlet orifice to form said bead, wherein said layered nozzle structure comprises means for biasing the bead toward the target substrate, and wherein the means for biasing the bead toward the target substrate is formed by the second front edge of the nozzle outlet plate and the third front edge of the bottom nozzle plate being beveled such that the second front edge of the nozzle outlet plate and the third front edge of the bottom nozzle plate are coplanar and define a planar orifice edge that is substantially parallel to the upper surface of the target substrate.