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Posted (edited) · Zits on rounded walls

Hi, I have a particular problem when slicing round walls. There is a break in the curve of the wall, and there is a small step on it (I don't know what to call such an artifact, to be honest). It's visible in the print preview (see pictures) and after printing it makes an ugly surface.

Screenshot2024-10-28at11_40_18.png.5a3c948a62ab0d668f56949444caca84.png

 

Screenshot2024-10-28at11_40_54.png.0c5962c5475cfbcbe39ad41685a67087.png

 

I hope there is some "magic" parameter I don't know about other than it's a bug in Cura. I also tried slicing it in PrusaSlicer (reminded me why I use Cura) but the resulting print was significantly worse overall.
I have the latest Cura 5.9.0-beta.1 but I ran into the same problem in an older version.
I would appreciate it if there is someone here who has managed to solve the same problem.
Vilem

UCP_outer_v7.2.3mf outer_v7.2.stl

Edited by raska-vilem
minor update
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    Posted · Zits on rounded walls

    The problem is in the Wall Transition Length and Wall Transitioning Threshold Angle as well as Minimum Line Width (which you have set to the line width of 0.40 which limits what Cura can do to mitigate the problem).

     

    On this layer you can see that there hasn't been a problem.  There is an inner wall whose line width has been adjusted to exactly fill the gap between the outer walls.

    image.thumb.png.6aad3045a0a29a94dc4882eb1984d9aa.png

     

    But the next layer has no gap to fill and so the outer wall line width needs to be adjusted.  That's when you get the funkiness coming in.

    (This is with the Wall Transition length adjusted to 3.0 and the Transitioning Angle at 10.0.)

    You can see that "steps" have appeared in the outer walls as the flow is being adjusted by Cura.

    image.thumb.png.879118782d3a64505a5b018893119d20.png

     

    This is an over view of several layers and shows the problem you have with your settings.  There is actually a gap on that one layer.

    image.thumb.png.0fc9d80f524f818573b07cc907cee7af.png

     

    Here I have made adjustments to the default settings and lowered the Minimum Line Width to 0.34.  The problem can still be seen but it is spread out and is less noticeable.

    image.thumb.png.5bb8d6922f9e18a0d5dca575540e58a7.png

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    Posted · Zits on rounded walls

    Thank you for the quick reply, I have adjusted the parameters and the areas around the spiral are significantly better. However, this is not the problem I was referring to, there are still those steps/bites on the outer wall. They are visible in the preview when looking at the wall in detail.

    Screenshot2024-10-28at14_37_07.thumb.png.f2e37ecaa6c4566b090d716437f97ed4.pngScreenshot2024-10-28at14_46_52.thumb.png.9682a2943b5b7bb8c6cda8bbf151bc50.pngScreenshot2024-10-28at14_47_53.thumb.png.6180578cc68c63b0cfc1ea917ff1e9c3.png

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    Posted · Zits on rounded walls

    I'm not getting those in my preview.  I wonder if it's just the on-screen rendering as opposed to something that is going to make it into the gcode.

     

    Pass along a gcode file.  I can read it into AutoCAD which can tell me if those are moves.  I also have an Excel macro that will chart the "flow" move-by-move.  One way or another, if it's in the gcode I can catch it.

     

    I can also open the gcode in the Prusa Gcode Viewer which can act as another sanity check.

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    Posted · Zits on rounded walls

    I see it there.  If those lines are 0.4mm wide then that jig-jog is about .026mm.  That may be a result of rounding in the code as it averages where it sliced adjacent triangles.

    You are welcome to fill out a bug report over on GitHub.

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    Posted · Zits on rounded walls

    I think that here is the same problem. Thank you, I‘ll post there 🙂

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