Thermal Runaway at various times throughout 3 hour print
I'm trying to print a PLA part on a 2.5S Printer. In the slicer, I've set my fan min to 20% and max to 30%. The first print was about 20 minutes in and I got a Thermal Runaway. I wasn't watching. Reset, cleared bed, restarted. I watched for a while and checked regularly. Missed it again at about 1 hour into the print. Thermal Runaway! UGH! Reset, restarted, watched, checked, this time I caught it about 1.5 hours in and the nozzle temp was dropping. Setpoint was 210 and it was at 190 and going down fast. I covered the nozzle fan and the temp stabilized then began to climb. I waited and it eventually climbed back up to 210. I removed the fan cover (small piece of paper with hole so some air could pass through) and continued to watch. It ran stable until about 2:45 into the print and Thermal Runaway again. Missed it! ARGHHH! If the temp is dropping, why is the fan running? I seriously think there's a bug somewhere! Why does it work to cover the fan when the temp reads low and then it stabilizes and climbs back to set point? I can't get anything done because I have to stay close and babysit this *&^%^ printer! Anyone have any ideas or suggestions what's going on and how to fix this? I have an 8 hour print I need to do soon. There's no way I'm going to be able to get through this without sitting right in front of this thing for 8 hours!!!