A multi-row melt-blown fiber spinneret (8) enables stacking rows (121, 122, 123) of polymer outlet orifices (36) more closely together than is achievable with conventional melt-blown fiber spinnerets. The fiber spinneret configuration also enables dense side-by-side packing of the polymer outlet orifices. The fiber spinneret is configured so that air knife channels (141C, 142C, 143C, 144C) and individual intricate small air knife passage feeds, together with their associated melt flow channels (501, 502, 503), are formed in the same body member. The rows of polymer outlet orifices are supplied with a polymer melt by a single polymer inlet (20), which delivers the polymer melt to the individual polymer melt flow channels. The air knife channels are directed through the body member, in which the polymer melt flow channels are formed by islands and air flow passage feeds. The body member is constructed by operation of a 3D printer for direct metal printing.