I can't say that I've ever smelled anything but warm electronics from a properly running PC. I'm also not sure I'd recognize a "copper smell" though. In general, there should not be any particularly strong odors coming from a PC. If so, I'd first look for wires resting on warm components (i.e. melting insulation); and then insufficient cooling (i.e. much hotter than normal components). Or some sort of muck that was put on a fan by mistake from someone who didn't clean up after themselves.
lol is the "Made in china smell" is the new "new car smell"?
Not even close!
Pick up a faux leather steering wheel cover in Walmart and take a whiff. Those things have the strongest stench of what I'm talking about of any product from China that I know of. Blech! It's just an odor that seems to emanate from anything made over there from synthetic materials.