Additive manufactured passive thermal enclosure

A computing device comprising:

• a heat generating electronic component;
• a housing that supports the heat generating electronic component, the housing having an inner surface and an outer surface;
• and
• a thermal management device supported by the housing, the thermal management device comprising:
• a plate mounted to the inner surface of the housing, the plate having a first surface and a second surface opposite the first surface, the second surface of the plate facing the inner surface of the housing, the first surface of the plate partially defining a chamber of the thermal management device;
• walls each having a first end and a second end, each of the walls being disposed on the plate and extending away from the first surface of the plate, at the first end, to the second end, respectively, the walls partially defining the chamber of the thermal management device;
• and
• a layer of first material disposed on the second end of the walls, the layer of first material partially defining the chamber;
• and
• a fluid, a second material, or the fluid and the second material disposed in the chamber.