There's an important extra ingredient that you didn't specify: FEA. He did a proper finite element analysis, which is the only way that I would be willing to be in the same room as a 3D printed pressure vessel.
Temperature was interesting though. I assume it partially because the hot water was mostly in contact with metal rather than plastic. I don't know what he printed it from but ABS's melting point[1] is only just above water boiling point. We've got a UV cured 3D printer at work (projet) which has some much better temperature properties.
[1] Technically "glass transition temperature" if you want be all materials-science about it
Temperature was interesting though. I assume it partially because the hot water was mostly in contact with metal rather than plastic. I don't know what he printed it from but ABS's melting point[1] is only just above water boiling point. We've got a UV cured 3D printer at work (projet) which has some much better temperature properties.
[1] Technically "glass transition temperature" if you want be all materials-science about it