I am having an issue where the nozzle temp swings 8-10 degrees (4 up, 4 down). It does this over and over again. The printer is seemingly unable to reach a steady state. It doesn’t do this all the time, but it is frequent. Is this normal?
I’ve uploaded a short video:
https://vimeo.com/storyshop/review/164189918/b6d2377aaa
Thank you for your thoughts!
J
Turn your filament cooling fan down some if you are using it. If you aren’t using it it could be the thermistor.
It could be signs of a failing power supply. Not setting extrusion fan to 100% helped, but I think the PSU will ultimately fail.
You might start by making sure your PID settings are correct. I have found https://www.lulzbot.com/support/fine-tune-your-marlin-pid-settings to be extremely useful at smoothing out the temperature swings when I swap hotends/extruders.
The PID tuning made a huge difference.
For the print I am doing in PLA I wanted the fan at 100%. I’ve alwyas found that with the fan set that high, the hotend barely has the power to hold temps. You know what? I did the PID tune while the fan was cranked to 100% and then put the values in the start script just for that temp/fan/print speed(volume of filament through the hot end can also affect temps) combo. It gets to steady state pretty quickly now, and stays dead-on except in circumstances when the extrusion volume changes dramatically etc… Then, it regains steady state pretty quickly. I highly reccommend PID tuning.
Thank You!