Abstract: An extruder head assembly, which is for an additive manufacturing machine, includes a melt zone component, and a nozzle operatively connected to the melt zone component. The melt zone component is operatively connected to a cold end component for receiving and heating filament. The melt zone component includes a heat source, and an interior member in thermal communication with the heat source. The interior member defines therein a passage, at least one melt channel, and at least one aperture fluidly connecting the passage to the at least one melt channel. The passage and the at least one melt channel are fluidly connected downstream from the at least one aperture, the nozzle being configured to receive heated filament material from the passage and the at least one melt channel.