Ruby is brittle, and if your hotend crashes into the bed due to bad settings, broken ABL, etc it might break. That's just based on what I read when I was considering buying one, I don't have any first hand experience.

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.

As much as i know how much a diamond back nozzle costs. If you print alot of abrasives its worth it, for context. Diamond back nozzles are like $100+ But they use PCD its manmade diamonds. And the most common instrustrial use for PCD is extruding wire.

Like electrical wire, they use PCD to strip the metal part of the wire for making wire. They easily have 4 months of life in Constant use.

Which when you factor its copper or aluminum its pretty wild.

So plastic is going to be 1000x that.

So a ruby just really is not worth it really its more of a gimmick. Because they cant be manufactured as precise as pcd

The idea is that just the very end of the path needs a precisely sized hole. Every other part of the path is wider, what reduces wearing, and doesn't need as much precision, so wearing isn't a problem.

I have no idea how it actually works on practice. I never used one of them, and I never used an abrasive material.

Everything will degrade should be your defaut assumption. The question is how long, and that feeds into the ecconomic question of how much is a given level of quality worth.

i can't answer your question, but hopefull this helps you understand why you didn't frame is quite right and in turn figure out the correct answers for you-

Dunno but oxbidian can handle a real beating.