

Durozzle is just a brand name slapped on some Chinese manufacturer. It’s probably fine, but I doubt anybody is going to come out raving about it compared to everything else on Amazon.
IIRC, rubies are great at handling abrasive filaments, but they lack accuracy. Been a while since I looked into them, though. I use abrasive filaments so seldom that I can consider a cheap nozzle to be a disposable part of the project. Metal is generally one of the easier things to recycle.
Then what’s needed is to organize smart engineers. This doesn’t need anyone like Musk. It can happen in a nationalized company connected to state-funded universities; tends to be easier to do when you don’t have a whole political party dedicated to sabotaging any attempt at this and then claiming it can’t work. All Musk does is extract value from the process for himself, and then make sure that political party stays at the top.