Thanks for a quick reply!
Sadly it's not my model and I only have a .stl file, thanks for menioning netfabb, I have the pro version but I've never used it... Anyway, neither mesh tools nor online netfabb fixed the issue. Nettfab's desktop version also did nothing (but as I mentioned I opened it for a first time and just clicked on everything). I'll try to tinker with it some more, remesh it, maybe add a custom support and see. Below is netfabb's model analysis, it looks quite all right although it's hard to tell since I don't have the original project.
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gr5 2,224
Did you design this part? If so I can explain how to fix the model - I think the normals are backwards for that one hole. I have instructions on fitting normals for 3 different cad packages.
Otherwise, you can mess around with the checkboxes in the section called "mesh fixes". Most notably maybe uncheck "union overlapping volumes" and maybe uncheck everything else as well.
Also there's a feature somewhere that sets some resolution parameter when trying to loop rings of points together.
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 issues so...
netfabb free repair service is here (you have to create a free account first):
https://service.netfabb.com/login.php
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