Extruder Temp Swings

[acucci]

I'm having the same problem. Recently broke down the extruder head to clear the PTFE tube and reassembled. Now it will not hold temp, swings +/- 7-8 degrees. I ran autotune and uploaded the new PID values (13.11 0.59 72.81) to no effect. Any other suggestions?

[spiderdaddy]

1. Did you save the values with M500?
2. Try autotuning again after setting those values, can be an iterative process.
3. Check the resistances of the heater and the thermistor.