3D printing gaskets

[Frank S]

I really like the concept of a 3d printed gasket, for the thicker ones such as Marksbug mentioned with an embedded aluminum or copper washer, maybe go with a percentage fill with tiny honeycomb cavities between bottom and top layers this would allow for a slight sponginess in the gasket without it being squished out from between the mating surfaces which may or may not extend the heat cycle life of the gasket.
Optimally if one had a printer with multiple nozzles they could be loaded with harder and softer filaments to take the place of the hollow honeycomb cavities and still retain the sponge like quality