Wild fluctuations in extruder temperature, has anyone encountered this?

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(Misha Tikh) #1

Wild fluctuations in extruder temperature, has anyone encountered this? I am using and e3d with 24v power to cartridge heater. I have run PID calibration and it is very stable when just sitting idle, but when it starts printing it goes crazy.

Could it be electrical interference from the motors? I put a ferrite bead on the sensor line but it does not seem to help.

(Joe Spanier) #2

Watching the video I have to wonder if your thermistor is bad. There isn’t any way you could actually be having these swings the block can’t heat and cool that fast.

(Misha Tikh) #3

I agree that it is likely a sensor issue

(Ulises Oyarzabal) #4

I spend exactly the same, my thermistor was making poor contact. sorry for my bad English

(Kenan Ataerk) #5

I agree to. Changing thermistor, may have a big possibility to resolve the problem.

(Nigel Dickinson) #6

Or it could be your right on the edge with your power supply

(Misha Tikh) #7

Thanks for the advice, I’ll replace the thermistor as the first step. Pretty sure I have a spare laying around somewhere.

(Björn Marl) #8

I would bet on a defective thermistor as well

(Roger Tee) #9

I had a thermistor with a broken wire about 3 inchs from hot end under the thermal insulation which I reconnected and all was good