A plant for making spunbond type polymeric filament defining an extrusion direction and including, in order along the extrusion direction, an extrusion head including at least one main channel to allow the passage of polymeric fluid through the extrusion head, a distributor including at least one distribution conduit in fluid passage connection with the main channel to distribute the fluid, at least one spinneret having holes each running parallel to the extrusion direction in fluid passage connection with the distribution conduit and suitable for extruding the fluid to make a respective polymeric filament, at least one distribution tank between the distributor, downstream of the conduit, and the spinneret, upstream of the holes, connecting, in fluid passage connection, the conduit and holes and defining a first thickness along the extrusion direction between 3 and 5 mm.