Reducing manufacturing defects of a wound filament product

A filament winding assembly comprising:

• a rotating mandrel coupled to a shaft configured to rotate the rotating mandrel, the rotating mandrel comprising:
• a first perforated sleeve defining holes and comprising a winding surface, and
• a second perforated sleeve disposed inside the first perforated sleeve, the second perforated sleeve attached to the shaft and defining an interior volume, the second perforated sleeve defining holes configured to form fluid pathways with the holes of the first perforated sleeve, the fluid pathways extending from the interior volume to the winding surface of the first perforated sleeve, the second perforated sleeve configured to rotate with respect to the first perforated sleeve to open and close the fluid pathways;
• a filament configured to be wound, under tension, around the winding surface of the first perforated sleeve;
• and
• a fluid source fluidically coupled to the interior volume of the second perforated sleeve, the fluid source configured to exhaust, through the fluid pathways, fluid from the wound filament.