What if I want to print PLA mix with CARBOBFIBER what do I have to Chang on my printer?
Nozzle, probably. Most composite filaments are abrasive and make a mess of soft brass nozzles over time. Various steel (and titanium, ruby, etc) nozzles that will hold up better are available. Keep in mind that they don’t heat up quite like the brass nozzles.
Nozzles with an 0.5mm or 0.6mm aperture are sometimes recommended for composite filaments, but if you go that route you’ll need to slice with Cura or something, since Luban doesn’t yet support anything but 0.4mm (they’re working on it).
Other than that, you shouldn’t need anything special as far as I know. Just make sure you check the manufacturer’s suggested temperature settings, and do a temperature tower before printing anything serious.