hey guys I just got my 1.5+xt. I did a couple test prints with the included roll. then swapped to protopasta carbon pla. A few days later I said self you destroyed your nozzle on your i3 when you swapped to carbon and had to get a ss nozzle. are the nozzles on the gcreate hardned or should I be switching to ss nozzles. printer is doing great by the way