Is there any reason *not* to use a steel nozzle for printing all materials?
Thermal conductivity of brass is approximately twice as better than steel (not stainless). Given that the size of nozzle is relatively small, it should be able to transfer enough heat for a medium-speed prints at least.
I have printed PLA and ABS using &quot;steel&quot; nozzle (brand of steel unknown) at the speed around 80 mm/s without any visible differences compared to brass.
However, an ideal nozzle (I see) is made of tempered bronze with polished inner channels. Bronze is known to have better friction coefficient and tempered one should be enough to resist carbon-type filaments more efficiently.