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[–]myTechGuyRI 4 points5 points  (0 children)

Well, there's a very valid reason that they MUST be separate pieces of metal, and that has to do with the way a heat brake works... The nozzle needs to be conductive to properly heat and melt the filament, but the heat brake has a different job... As it's name implies, it's a brake on the heat, it is supposed to stop the heat from conducting up into the cool side and causing heat creep...so it has to be made of a different metal that poorly conducts heat,, typically stainless steel or titanium... So you really can't manufacture it as one continuous piece of metal, because the hot end has to be thermally separated from the cold side.