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autoleveling issues second nozzle

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on auto leveling my seceond nozzle is pushed up on the leveling spot on the right side of the glass bed. The nozzle is pushed until the first nozzle comes in contact with the glass bed. At this point the autoleveling registers something and is continuing. 


The result is that the first several layers are all printed with full conact to the glass bed and no material is extruded at all.


One reason could be that I needed to remove the complete printhead structure once and might have reassembled the mechanics of the second nozzle wrongly. Is there a manual how to assemble it anywhere? Or do you know another reason why it behaves like that?


One interesting thing. If I push in the material from the second feeder as far as possible (by hand) the autoleveling works mostly because the nozzle cannot move up during the leveling...



thank you 

best regards


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Hi Florian,


Can you try to power down the printer and try again? This might seem stupid, but the sensor is highly sensitive and calibrates itself. If by any chance, you've touched the sensor or had your hands in the machine at the time it calibrates, you could get strange readings causing the printer to not find the bed.

If the problem persists, it could be that the sensor is broken. In that case, please contact your reseller.

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If you drop the print head bracket down, you'll see a small board at the back of the bracket. That is the sensor.

May I ask, is this a UM3(e), an S5 and how old is the printer? If it is an older UM3, it might have a print core spring that has become too loose. Either way, please contact your reseller.

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It is a UM3. I think it is about 2 years old (or 1.5 or something like that). 


how is this spring placed? On top of the mechanik below the top of the print head, right? Just to make sure I reinstalled it correctly.


I know the small board you talk about. I had one print that got completely catastrophal. Everything was covered with pla inside the printhead from the bottom up until the borderwalls between the nozzles. There is a big probability that this board was actually hit with it too. But I checked the cables connected and these are still fine. Perhaps there is some defect regarding the board. Are there replacement parts for that board?


But really the most important question I got:  how is this spring placed?

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