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Dreidee

UM3: temperature drops 30°C each minute while printing

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Hello there,

I am a happy UM3 customer, but since 2 days I have huge temperature drops on my right extruder.

The left one (material 1) is completely ok, the right one (material 2) shows continuous temperature fluctuations of up to 30°C each minute or so, making my prints all unusable.

IMG_4020.thumb.JPG.968d922bf9b8e77dc50c4c82ee2311f1.JPG

IMG_4023.thumb.JPG.b9ad3bf19fd799ab9601c1d5d4efba70.JPG

I tried with different print cores, and with different materials.

I checked if the connector in the printhead is connected, all fine. I tried pushing the cable a bit further down into the print head and fix it with tape (read it elsewhere), but didn't help. I use Cura 3.1 (stable version) as well as the current stable firmware.

Is this broken hardware or a software bug?

Thanks a lot,

Chris

IMG_4020.thumb.JPG.968d922bf9b8e77dc50c4c82ee2311f1.JPG

IMG_4023.thumb.JPG.b9ad3bf19fd799ab9601c1d5d4efba70.JPG

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I also noticed temperature drops of the right extruder. Only 10 degree drops but still. Screenshot of the temperature graph running firmware 4.0.

temp-drop.thumb.png.bb3c9cdc2e000d36fd587a5911c9cce1.png

To me it looks like the power management is somewhat off. The IMHO undersized power supply probably doesn't help.

I remember reading that Ultimaker changed a few power setting with 4.0. Maybe @maht or another UM employe can help us to fix the problem?

temp-drop.thumb.png.bb3c9cdc2e000d36fd587a5911c9cce1.png

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