Heater Bed Fluctuation
I just retrofitted my Creality CR10 Pro with a duet 2 wifi and Im seeing very high fluctuation of my bed temp (using bang bang method). This only starts about an 30mins after starting a print and when I pause printing the line straightens out. Paused, I also wiggle some cables to see if it fluctuates but it doesnt seem to. Any ideas what the issue might be?
Is the bed thermistor wiring running near any stepper motor wiring?
I suggest you do a PID tuning of the bed and save the results. Bang bang is not recommended.
deckingman last edited by
@jsera That temperature trace is showing temperature excursions of around 20 - 30 deg C in a matter of seconds which can only be a noisy signal. As @Phaedrux said, check the routing of the wiring. You haven't told us what temperature sensor you are using but it could be a faulty sensor. If it's a PT100, use 4 wire and/or screened cable.
Thanks for the tips guys, yes its right under a stepper and the more I notice, it fluctuates more when that axis moves. I havent seen what kind it is, but it has 2 white wires so Im thinking its the same as the hot end, 100k thermister.
So the cables were very close (y stepper and bed thermister). I separated them and shielded the stepper and now its a straight curve. No fluctuation anymore. Thanks for the help!