Mold stack for forming 3d glass-based articles

A mold stack for forming 3D glass-based articles, comprising:

• a plenum having a plenum base integrated with a plenum enclosure wall, the plenum base and plenum enclosure wall defining a plenum chamber;
• a cooling structure disposed within the plenum chamber, the cooling structure comprising:
• a cooling structure enclosure wall integrated with the plenum base such that a portion of the plenum base forms a cooling structure base, the cooling structure enclosure wall dividing the plenum chamber into a cooling chamber within the cooling structure enclosure wall and a process chamber outside of the cooling structure enclosure wall;
• a diffuser plate mounted on the cooling structure enclosure wall, the diffuser plate isolating the cooling chamber from the process chamber;
• and
• an inlet hole and an exit hole formed in the cooling structure base, the inlet hole and exit hole being in communication with the cooling chamber;
• and
• a mold having a flange at a periphery thereof, the flange being removably attached to a top surface of the plenum enclosure wall.