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UM2 hot end leaking

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Posted · UM2 hot end leaking

Hi all,

I have been successfully using UM2 since March 2014!

I am a newbie to the 3D print world....but so far so good!...

I have read many threads in this forum and have managed to get over the steep learning curve!....

Now I am in need of some help.....

This morning I set off a print and when I came back to the UM2.....I saw that there was a blob of PLA stuck to the extruder.......print was not going well!

So I quickly aborted the print....and checking the hot end....I saw there is a blog of PLA around the heater block (see pics in link below).

Any ideas on how can I remove this blob?

Is this because the print didn't stick to the surface and hence it stuck to the extruder?

OR worse....is there a leak....if so how can I go about fixing this?

Thanks all in advance!




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    Posted · UM2 hot end leaking

    it's probably just plastic curling back up under the fan shroud when the print starts to go wrong. It's not super-common, but it has happened. See this other recent thread for info about getting it out:


    When you put it all back together, you might try carefully turning the metal 'collar' that has the holes in the side, so as to move the nozzle down just slightly further. There should be a gap of 1mm between the bottom of the white teflon part, and the top of the 'collar'. Be sure that you don't set it too low, though, and push the nozzle block up against the bottom of the fan shroud.


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    Posted · UM2 hot end leaking

    If you rotate the collar only do it with the hot end at 180C because you can break it without all that much force and PLA is probably in the threads right now. However unless you take the whole head apart (probably only need to remove the fans) then I wouldn't touch it.


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