Thanks for your answer.
I'll try that first, but I'm afraid I need to fix the problem in CAD. The model is very very complex and this is not an option to fix it wall by wall.
If a tool could enable to thicken all at once, it would be great. I'm not looking for an accurate printing, but a good overall shape and recognizable mockup.
In cura you can set horizontal expansion to 0.4 and it will thicken everything. This may mess up many things in a bad way. It won't affect vertical so a thin enough horizontal wall may be between 2 layer slices.
The best way is to fix it in CAD - one wall at a time. So you can think about if it makes sense.
0.4mm is the minimum wall thickness if your line width is 0.4 and you have "print thin walls" checked. 0.8mm is the minimum wall thickness if you don't have that checked. For curved walls - after they are converted to triangles, some portions will be slightly thinner or thicker so you need a 10% or so margin.
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