Currently there is no firmware for increasing the max temp output if switching out the hotend. Any chance we can get that upgrade??? The Ender 3 4.2.7 Bl touch firmware is pretty sweet so far except I upgrade that part and now it errors out lol
I had trouble building the 4.2.2 for the Ender 3 Neo when I tried to crank the hotend temp up to 300C for the Spider 3.
I modified all kinds of things trying to get a working code, but I think the most significant thing I did was to raise the max temp to 285C instead of 300C. Seems like there’s a check in the compiler to make sure you don’t exceed the hotend thermistor max temp (which it thinks is 300C for some reason), and the compiler(?) allows for a 15C temperature swing from the max set point. So, 285C + 15C = 300C
Don’t know if this will help, but I looked through a lot of the Marlin high temp firmware builds and couldn’t find anything that set the max hotend temp past 285C - which should support Nylon, etc. for your builds.
Good luck!