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Underextrusion after few layers with UM1

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Hi community!


i am facing a problem which i can't solve by my own anymore, so please help!

I have been using my UM since over a year now, without any Major Problems. But now since a few days my Printer will stop extruding after printing a few layers (see pic). After I stop the machine then, I could still extrude the Filament by Hand.

So this is what I have done so far:

- Demounting the nozzle (see pic), in my opinion no clogging - though the Filament Looks weird, it is hollow until the upper end of the hotend brass part, before demounting the nozzle I retracted the Filament by Hand when it was still hot. (see pics)

- Tightening the Extruder spring until 12mm length - still I see chewing on the Filament (see pics)

- Smoothing the bowden tube with oil

- PLA printing with high Quality Profile, at 240°C (normally 205°C)


What else could i do to print again? The last days i was printing objects with a lot of retraction, could that be a reason?


I am using:

- Hot end v2

- Extruder spring design v3



Cheers and thanks,









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After I stop the machine then, I could still extrude the Filament by Hand.


Did you try extruding a lot? Sometimes you can extrude by hand but only 5 mm and then it clogs again.

How did the pressure feel? Did it seem more clogged than usual?

What is your layer height and speed exactly? I dont' know what "high quality" is and besides it is different for diff versions of Cura. Just save the gcode file, then turn off quick print mode, then do "file" "load profile from gcode..." and load it back in and see what speed/layer height you used.

So one possibility is you are just printing too fast (too thick of a layer at too high speed).

Another is that the fan cools your nozzle too much.

Another is a partial clog.

Another is that your temp isn't truly 240C - UM Original has problems with temp sensor and sometimes it is off by 30 or 50C. Try setting temp to 95C and touch water to hot end, then set to 105C and make sure a drop of water boils.


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Have you try to change the filament? It happen to me the same with a new roll from igo3d. I try everything, then I realise the filament diameter was not constant. It varies between 2.96 to 3.2 and when the thicker part arrived to the nozzle it becomes in underextrusion. Testing and with the hand it works good but not while printing...

It's one possibility...

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Thanks a lot for the tips!

I changed the Filament and now it works again. It was a new roll of white PLA from German RepRap.

The Diameter seems ok ~2,90 but it didn't work for some reason (maybe also humidity???). On the other Hand I'm still not 100% sure if that was the main reason because in my Panic Phase I changed things in parallel (nozzle, Extruder bolt). When I have more time I will try to examine the Filament again - but for now the risk is too high because I have 4-5 hours prints to do!


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