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Movement of extruder motor (even without filament) causes temp reading to artificially dip and overshoot


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Posted · Movement of extruder motor (even without filament) causes temp reading to artificially dip and overshoot

This is a very strange thing. I've been haunted by this issue by an original Ultimaker and an Ultimaker I built myself. I've had some intermittent temperature stability problems. In diagnosing this issue, I have discovered that when the extruder motor (and possibly other motors) is driven even without filament, the temp reading drops ~5C immediately. The temp controller compensates for this artificially low temp and pumps up the power. The instant the extruder motor stops driving, the temp snaps back up ~5C but by then it has overshot. This has happened on multiple Ultimakers with different hardware. I originally diagnosed it as a blown up stepper motor but now I'm not so sure.

 

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    Posted · Movement of extruder motor (even without filament) causes temp reading to artificially dip and overshoot

    Indeed interesting. Sounds like cross talk or (partial) short cut somewhere. Maybe you can check / answer a few things:

    - Do you use an original UM shield PCB or a legacy board?

    - Are the wires of the motor nicely twisted?

    - Do the motor wires run in parallel with the sensor wires?

    - Does the effect exist for any motor, i.e. also for x, y and z axis?

     

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    Posted · Movement of extruder motor (even without filament) causes temp reading to artificially dip and overshoot

    Ultimaker 1.5.7 shield

    motor wires are twisted nicely

    motor wires do run in parallel with thermocouple amp board's power and signal wires

    I'm still experimenting with other motors' effect

     

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