Kywoo Tycoon 3D - Impossible to print after using PETG

[Bikeracer2020]

Just be aware that a hardened steel nozzle might cause problems for normal plastic filament, if it does, just fit a normal brass nozzle.
I believe it's to do with the friction of the hardened steel, anyway just try it first.

Also if you change a nozzle, heat the heater block up by 10-20 degrees above your normal print temps and then tighten the nozzle home, same when removing a nozzle. This is to prevent leaking filament.