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Zits and blobs on the inside wall only

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Posted · Zits and blobs on the inside wall only

Hi all,

While printing with Ultimaker ABS using the nearly default CURA 4.11 Engineering Fine settings I am getting zits and blobs on the inside wall only, the outside wall is clean (the only changes to defaults are walls and top/bottoms set to 2mm and infill to cubic subdivision 15%). The printer is enclosed and the doors were closed. The room temperature is a bit high (30 - 31 deg C, but with low humidity - about 30%. PLA prints fine. With the next print (pics attached) I've also reduced the overall print speed (from 30 to 25 mm/s) and enabled coasting in experimental section), but it didn't help.


Interestingly the zits and blobs become much more frequent with height (the object I printed nearly took the whole print space of S5), so maybe it is a ambient temperature / cooling problem?


By the way, the external surface is not perfect either, some layers are wider than others...?



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