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.
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