Never seen anything like that on Ultimaker with Cura, so I doubt this is bad slicing.
Good to know, and PERHAPS this might be causing it: a model of a thin walled cylinder is never 100 % round. The cylinder has sides and although it might seem round when there are many sides (120 or more for instance), it actually isn't. Curves don't really exist in a digital system, they are always "steps".... As a result, the thickness of the wall is never exactly the same all over. This is always the case in all curved walls.
So if you have a straight wall that is exactly 0.4 mm thick, when you put a curve in it there will be areas where the wall thickness will be less than 0.4 mm, which usually results in Cura "skipping" these areas.
When this happens, an easy way to solve it is to scale up the model just a tiny bit. 0.5-1% is usually enough. Or you can change the setting for the nozzle size a bit, that also works.
In your case it might be the other way around (so that some bits are just OVER a certain wall thickness) in which case it might help to scale the model DOWN just a bit.
And you only need to scale in x and y direction, no need to scale the height as well.
Again, I doubt whether this is the cause, never seen defects like that, but it can't hurt to try scaling to see if it helps.
Recommended Posts
Dim3nsioneer 558
What if you change the nozzle to 0.25mm and slice it with this size? Cura has a problem with dimensions that do not allow a doubled wall...
Link to post
Share on other sites