It’ll probably fail at some point, but the failure mode is probably a crack and a leak, especially on the threaded connections. That said, making this out of s

It’ll probably fail at some point, but the failure mode is probably a crack and a leak, especially on the threaded connections. That said, making this out of steel would be much safer. Seems like the person that wrote this is pretty uniquely frugal, and doesn’t value their time, so I’m going to wager that will give them a happy chance to redesign the part. They could have done some contract design work in the time they spent on this and bought a nice espresso machine plus had some money to stick in the bank, but I suppose that isn’t the point.