90% of my printing is carbon fibre filled, usually PLA. The regular hardened nozzle is a bit prone to clogs. I've been printing with the plated copper nozzle and watching for signs of wear - I can't see any after 500g of carbon but of course it is hard to see. I have had some blobby prints, but that could be any number of things.... Anyway Nozzle X interests me - but I'm not sure that i see the point. Is the nickel plating on nozzle X harder than the nickel plating on the copper nozzle? If not why not just use the copper nozzle? Will the nickel plating on nozzle X wear off after 10kg plus of carbon filament? If so I'll stick with the regular hardened nozzle. In short - What is the point of using hardened steel only to coat it in something less hard?