First of all - all that red in cura xray view is a problem.
Is it possible for you to merge all your parts into one large part? if you have two separate solids touching each other then you have a shared wall. Cura does not like this.
The STL file is a list of unordered triangles. Cura intersects planes with the triangles (slices it). Each slice generates a bunch of *unordered* line segments. The key here is that they are unordered. Cura then tries to link these lines into loops. Because of floating point errors when two lines are supposed to be connected at a point, sometimes the X,Y values of that point aren't quite the same so Cura has to fudge a bit and sometimes chooses the wrong line!
Because of this - having two solids touching each other that have a shared wall can be a problem.
I skipped a few steps here in the explanation. Let me know if I need to clarify this.
Not solved yet, It looked better then it was
What is the best thing to do ?
Find an online model fixer. You model is invalid, which makes Cura interpret the mesh different from how you would expect it.
OKE, Indeed it looks like a mess I think I will design the parts again in a more proper way.
Thanks for your advice
Are the surfaces thinner than your nozzle width and how does the model look in x-ray view?
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