I made a model for 3D printing, (you can see what it looks like in the first picture) and I uploaded it to i.materialise.com for 3D printing with titanium metal. When the website "fixes" my model you can see some artifacts around the head (second picture). The head was attached to the plane by a Boolean modifier via the Union method.

Am I doing something wrong? Is there a way to fix those artifacts?

You can check out the "fixed" model here: https://bit.ly/3cAhwaT

Blender model wireframe

Website artefacts


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