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It was good at first, but then it was a nightmare


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Posted · It was good at first, but then it was a nightmare

It looks like you have severe underextrusion, something stopping or blocking the flow.


There could be a zillion of reasons, blocked nozzle, nozzle too cold, filament too thick or getting stuck, kinks in the filament,...


On this forum, try searching for causes of underextrusion. User gr5 has made a good and extensive diagnostics list that he posted several times. That should help you going.


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Posted · It was good at first, but then it was a nightmare

Hi @eric_huang,


You added many pictures of your problem and this is really a good information that's give some information of your problem.

I'll think your problem is the first layer nozzle pressure that's very high and this is "often" caused by "too close" bed nozzle distance.

However, In the latest versions of Cura, the initial flow (for your printer UM3) is increased from 100% to 120%.

I do not know if this is made intentionally or not, but I'll think this might be your problem if you use the last version of Cura. According to Cura 4.5 your printer use 100% flow in this version.


So if you're using Cura 4.8 this might (?) be your problem.


For this reason your feeder cannot make the pressure any higher and start grinding into the filament.


Here is one of your picture magnified some -that I made with some note on:



Well, -just try to reduce the initial flow in order to reduce this high squezing effect.






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  • 3 weeks later...
Posted · It was good at first, but then it was a nightmare

Hi Eric,


Great that you've got your printer back in service.


Sure I missed this one..

I'll think this has happened before as well.

Actually you can see this here in your picture:




Yes, -this was a learning for me, but hope you kept the unit that was changed, cause this parts is possible to print.

As this is an UM3, all the stl files for such parts is open source..


I've just put up the picture for others to see.





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