I am looking for troubleshooting help on my printer. Recently the hot end just can muster the courage to go past about 70 °C.
The hardware - Ender 3V2 with a E3D V6 hot end. 24 volts
I changed the thermistor to a new one. Before heating, it registers an appropriate 10 °C in line with the bed temp sensor.
With the thermistor checked good, I looked at the heater element. It is reading 22 Ω. The documentation from E3D is not clear in what wattage heater I bought, but if it is a 30 W 24 V heater, it's on the high end of acceptable.
- A 24 V 30 W heater cartridge will read between 16.7 - 22.6 Ω.
- A 24 V 40 W heater cartridge will read between 12.3 - 15.1 Ω.
If anyone is able to confirm how to know what my heater wattage is supposed to be, LMK. Options are shown for blue wires, red wires, and yellow. I have yellow.
If the resistance is in spec, I checked if the voltage being supplied to the heater is correct. It is reading 23.6 V which seems good.
I have attempted to PID autotune in Pronterface which I had also done several times previously before the issue. If I try to target anything over 70 °C, the attempt to tune fails because it can't get hot enough. I can tune if I set the temp to 65 °C by comparison.
The temperature trace in Pronterface shows the temp rising quickly through the 30s, 40s, then plateauing and maxing out in the high 60s.
I am looking for advice on where to look next for trouble shooting. Seems odd to suddenly have such a low temperature limit capability that I can't root cause.