Assembly comprising a center-fluid distributor and a multi-fiber spinneret

An assembly comprising a multi-fiber spinneret comprising at least two nozzles, and a center fluid distributor comprising a single inlet port for a center fluid and at least two capillaries in fluid communication with the inlet port;

• wherein outlet ports for the center fluid are defined by orifices of the at least two capillaries, the outlet ports being connected to one or more center fluid needles each providing a central orifice of a nozzle of the multi-fiber spinneret, the at least two capillaries being configured to distribute a flow of center fluid provided at the inlet port between the outlet ports in such a manner that the flow rate through all the center fluid needles of the multi-fiber spinneret is the same, wherein the length of each capillary is adjustable to offset differences in flow capacity between the one or more center fluid needles caused by differences in the dimensions of the one or more center fluid needles.