@gr5 Hello, thanks for the tips but it is not working. i make the models my own with (Sketchup). and i remade a piece of this model and now are my screw threads not full round anymore (In Cura in my software and online software its round) See screenshot. do you now how to fix that?
Did you create this model or did you download it? I think it has errors. What CAD do you use (I have different advice depenind on the CAD).
Cura has an amazing plugin to test your model to see if something is wrong with it and can repair a very few of the many potential problems:
In the upper right corner of Cura click "marketplace" and make sure you are on the "plugins" tab and install "Mesh Tools". Then restart Cura. Now right click on your model, choose "mesh tools" and first choose
"check mesh", then "fix model normals" and "fix simple holes" to see if that helps. Cura doesn't fix most is
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