a spin pot for spinning synthetic polymer fibers has a polymer filter , a spinneret downstream of the polymer filter , and an electroformed perforated screen positioned between the polymer filter and the spinneret . the screen is most preferably electroformed nickel and includes an annular non - perforated region which bounds a perforated central region . the electroformed perforations prevent debris that may become dislodged from the filter unit from blocking the spinneret orifices thereby creating undesired &# 34 ; slow - holes &# 34 ;.