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Odd artifacts


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Posted · Odd artifacts

I've noticed these odd square structures in a few models. They pop up randomly usually in or near corners and are only in one or two layers then disappear. I don't think they affect the printing quality but I'm just curious.

Cura Capture.JPG

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    Posted · Odd artifacts
    10 hours ago, ahoeben said:

    It looks like they may be part of the model. Can you save a project (File -> Save project...) so we can check out both the model and your settings?

    Project attached. It's a Thingiverse STL so I don't have the original model. I found a few other anomalies, extra interior walls that aren't attached to each other. I've tried running it through MeshLab following a tutorial and while it found and fixed several problems it still shows up the same in Cura.  Strange thing is I tried slicing it with PursaSlicer and none of those show up and there's no message of it not being watertight.

    Cura Capture2.JPG


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    Posted · Odd artifacts
    -> Analysed your file:
    --> 0 Naked edges (?)
    --> 0 Planar holes (?)
    --> 0 Non-planar holes (?)
    --> 263 Non-manifold edges (?)
    --> 384 Inverted faces (?)
    --> 0 Degenerate faces (?)
    --> 259 Duplicate faces (?)
    --> 0 Disjoint shells (?)
    -> Repairing: 100.00%
    ----- Repair completed in 12051ms ------
    -> Vertex count changed from 8676 to 9147 (+471)
    -> Triangle count changed from 17636 to 18314 (+678)
    -> Problem.stl available for download. Click the button below to download
    I used https://formware.co/OnlineStlRepair for the repair.  Here is an STL.
    It looks good to me (but so did my first wife).


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    Posted · Odd artifacts



    Well it seems to have printed fine but I wasn't able to hover over it to see if the weird stuff actually printed or not.

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    Posted · Odd artifacts

    You can also diagnose this in Cura, using X Ray view:



    The X Ray view (left) shows that the model has an internal subdivision right where you are getting the extra walls. The generation of the extra walls is probably caused by a rounding issue of coordinates in the model.


    Interestingly the model check in the MeshTools plugin does catch the issue with the model, though Cura itself does not.


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