About 1/2 of the way through the print I had a thermal runaway anyone know why it happens?? And what is the cure? Just need an answer quick to get the print done. Thanks
What style of head do you use? New Hybrid or V1.0? Maybe there is a bridge to be print at that stage of the print? Maybe the fans kick in too high? Old style head with fans does not really support more than 80% of fans and you have to position them as low as possible...
I'm using PLA. What is the highest I should run the fans at?? They have been set to only go up to 70% dunno why they have gone to 100% how would I lower the fans when bridging?? It's come out really nice what it's printed
All things being equal, I found PLA to be relatively friendly to thermal runaway. When you increase the nozzle temperature from 210 to 250 to print something else, the heater has to work a lot harder just to keep up the temperature. So it's in a worse position when the fan comes on. And then if you do 250C and and a Volcano pumping lots of cold filament through: my experience is that one can FORGET using much of the fan at all. Kapton tape has arrived but have not started wrapping the heater blocks yet. Also 3mm bullet connectors have arrived so could swap in the e3d 40W heater (the BB is 30W by standard)...
I'm going to probably change out the heaters then. Didn't realise they are only 30W might set it to eventually run the fans at like 40%
There are people who disagree with me. All I know is that when I attached an oscilloscope is that to maintain the nozzle at 250C with no fan and no extrusion, the PWM has the 30W on for 75% of the time. (And the resistance of my heater suggests it's on spec, the voltage of my power supply is above 24v.) I really have the impression it's doing it's best!
Must get my scope out and actually use it........... have you tried looking at the motor signals too?
But it would still be interesting to know if it is possible to see the signal and what (if anything) it can tell us. Sometimes you have to do things just for the hell of it.
