path from the external ports to the micro channels at layer 16 the layers are aligned and clamped or otherwise held together to form the extrusion device fig3 shows these layers in more detail the nozzle exit orifice or outlet 42 extrudes a stream of materials the first material flows through the feed channel 40 from which the first material transitions upwards into the inlet channel 32 and then flows toward the outlet 42 a second material flows through an inlet for the second material 30 and joins with the first material one should note that the flows may join without mixing with the final flow exiting the outlet 42 consisting of u2018 stripes u2019 of the first material and the second material the inlet 30 receives the second material through the port 38 in layer 22 an additional layer 24 may also have a port 36 which is fed the second material from the feed channel for the second material 34 in layer 26 when the layers are aligned and stacked the feed channel 34 will align through the ports with the inlet 30 the stack of layers may consist of only two layers one for the inlets and the nozzle and one for the feed channel in this particular embodiment the second material may consist.