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So I think I solved the problem and found the root cause. After additional test prints and just changing a single setting with every print, I found that it is caused by the mixed speeds which is used by default. Just lowering the generic speed was not helpful, but equalizing all speeds to the same value did the job.
I was also wrong, that a 2 walls print and a print with the UM2+ Cura profile is good. They are much better, but under the magnifying glass I saw also very tiny gaps in these objects.
Anyway, it shows once again how important it is to adjust the speeds and not to rely on Cura's default calculation. With the UM3 and S5 I always do this, because otherwise I don't get dimensional accuracy. With the UM2 printers I have never needed this before.
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Another Cura release has arrived and in this 5.8 beta release, the focus is on improving Z seams, as well as completing support for the full Method series of printers by introducing a profile for the UltiMaker Method.
We are happy to announce the next evolution in the UltiMaker 3D printer lineup: the UltiMaker Factor 4 industrial-grade 3D printer, designed to take manufacturing to new levels of efficiency and reliability. Factor 4 is an end-to-end 3D printing solution for light industrial applications
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Smithy 1,145
So I think I solved the problem and found the root cause. After additional test prints and just changing a single setting with every print, I found that it is caused by the mixed speeds which is used by default. Just lowering the generic speed was not helpful, but equalizing all speeds to the same value did the job.
I was also wrong, that a 2 walls print and a print with the UM2+ Cura profile is good. They are much better, but under the magnifying glass I saw also very tiny gaps in these objects.
Anyway, it shows once again how important it is to adjust the speeds and not to rely on Cura's default calculation. With the UM3 and S5 I always do this, because otherwise I don't get dimensional accuracy. With the UM2 printers I have never needed this before.
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