It’s something [Fab] is using, in a vacuum chamber made from Plexiglass. A simple Plexiglass box would collapse under the air pressure on its own, so to mitigate that it’s made from a piece of ...

The big steel cooking pot is an easy ... sheet used for the chamber top, which seems a little on the thin side to us. You can see it flexing in the video below as vacuum is pulled; it survived ...