Well, of course, I had to go google that Integza guy and, well, that was pretty interesting stuff! Some of it seemed a little scary to a non-chemist like me. I worried about the fumes he was creating with that silver and all! But really interesting nevertheless! And his printed nozzle worked OK, but I think his rockets would have worked better if he had a smaller throat which would have built up higher pressure and thus higher velocity of the gas being expelled from the nozzle. But hey, I'm no rocket scientist! And his video was sure fascinating!
Kim
As he said, the fumes are just water vapor so it's probably one of the safer things he's done.
Things may be different in the 'Land of the Free'
He's Portuguese. And it isn't any easier to get stuff like that in America than anywhere else, we may seem insane to you but we aren't really...