Here's some diagram about different nozzles for printers. Nothing special, but maybe interesting. I'm using brass so far, but also have steel nozzles in case I might need them. Only recently watched a video where carbon fiber nylon filament actually got some recommendation, the claim was that this combination would print really good on normal printers. Of course, that still needs a harder nozzle than the brass ones, which are good as standard nozzles.
Just wanted to mention, that it is a good idea to make sure, if you disassemble your printer, to check that the screwheads of your screws a still fine. I wrecked one of my screws in the printhead and now need to drill into the screw and use a lefthand drill to remove it (Not asking for common ideas, already looked into my options).