Changeing nozzles is always rather fraught. I was hoping that the ruby nozzle would be fit and forget and I have not been disappointed. Works equally well with normal PLA and carbon loaded filaments with excellent surface finish on my Creality Ender 3 S1 Pro. This ruby nozzle has turned out to be great value.

Been using these Ruby nozzles for a few months now and they seem great. Only a few rolls of CF have gone through but all is good so far.