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UM3 print head assembly fell apart?

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Posted · UM3 print head assembly fell apart?

So..   I did an over night print,  and somehow the melted filiment backed up, and filled up the interior of the print head.   First picture is the bllob that I managed to pullout.    it litteraly pushed the door/flap thing almost all the way off.  (see pic two)


there are now 4 wires  (two groups of two)  that are obviously dangling/disconnected. 


The pair in the back (white and red), look like they probably go to the "sensor" and "shield"  pins on the board.  (I think)


the other pair are both white,  and seem like they are  high temp?   NOT obvious where they go.


The last pair (that I think are still connected), probably go to the fan.


My Question:   Please tell me where they need to go??


Thank you in advance.




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    Posted · UM3 print head assembly fell apart?

    Hi @Dantan,


    Sorry to see this happen. 

    Your nozzles look very covered up with filament build up. Maybe your print object came loose of bed and just got glued to

    the nozzle?


    The two wire's white/red are for the heater power, if you remove the left core the two wire's will follow as they should be attached to the connector board on the core itself.


    Red and white wire's in the middle is for the capasitive sensor (sensing heat board nozzle distance).


    It should not be possible to see the two wire's white/red to come down like this?

    Did you have to remove the left core for cleaning up?


    Or, maybe the two heater wire's was captured by the filament and ended pulling the wires from the connector on the PCB

    (printed circuit board). Should be possible.. If so this stopped more extrusion from this nozzle.


    Strange things happen sometimes.


    Good luck.







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    Posted · UM3 print head assembly fell apart?

    So......   the order of events:     when I saw the blob all up inside the enclosure,   I backed the filament out of nozzle 1....  (successfully) ,  I pulled the  "blob out",  and it pulled the wires out..  and I immediately got an error saying something like nozzle heat too hot.....   error..  and the heating shut down.


    The print core for #1,   is jammed tight, and will not pull out(also has two wires pulled out) and    the print core in #2,  will not come out either,  because I can not heat/back out the filament.


    I think I am going to have to take the entire assembly apart..   😕     can anyone recommend a good video/tutorial on how to do so? 


    I did get this machine recently,  and I do not know how well it was maintained.    If I have to open it up anyway,  any recommendation on maintenance I should do while I am there?



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    Posted · UM3 print head assembly fell apart?

    Hi @Dantan,


    Here's a link to a tread in here that is a must to read before beginning any disassembling.

    There's a few thing to know about in order to avoid mishap.



    Good luck


    There is also some document for this printer.





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