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I used genuine UM ABS for the first time and this is what happened

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I bought a UM3 extended about 9 months ago and my experience with it has been up and down. Some really great prints but more often than not, failed prints for no apparent reason. Anything longer than a 18 hour print seems to be a gamble on my machine. I attributed it to inexperience however my results have become worse since buying the printer, not better. I thought it's because I'm using non-UM materials (I use Formfutura mostly) so I got myself a few rolls of true blue Ultimaker ABS and printed with Cura recommended settings using a 0.4mm print core, not changing a single thing, hoping to see better results. And 12 hours in, this is what I got.

I sometimes get the same from Breakaway (especially when using recommended settings) which is why I stopped using the stuff.

 

What could be the problem? Can my print core somehow be defective?

 

image.thumb.png.7b391013d3bd7d48a9fa8eff81fd3187.png

image.thumb.png.f97673978bce23c1a0b4e8ba2f600b3f.png

image.thumb.png.b57e3cb04bca75ebd2e61dc8546fe130.png

 

 

 

Edited by Patronus
typo

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Hi,

 

This looks like underextrusion. Make sure to clean your printcore often, maybe it's also worn out or "unfixable" partly clogged after that time and you need a new one.

For me the UM ABS always used to work fine with standard settings. When I use Formfutura ABS, I had to go down with the printing speed, otherwise it always used to look like your pictures when making long prints.

I figured out to reach higher speeds with Formfutura ABS with the Matchless Race nozzles by 3D Solex. With that setup (of course with some nozzle replacing), I'm printing about 3 kg Formfutura EasyFil ABS each week for the last 1.5 years on my UM3E with an success rate of maybe 80 - 85%.

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@DF-Werkzeugservice I think you are right. I have narrowed it down with 99.9% certainty to the printcore itself. I think it's partly blocked in a permanent way because I've cleaned it many times but the result always stays the same. Alternatively it may be a temperature issue whereby somehow the print core slowly cools down as it prints because of a temp sensor issue. Now that I use another print core things work fine. Maybe I can give breakaway another try since I always used this printcore for that, and from day 1 it was a bit of a disaster.

 

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