I'm working on a cap for a little device, but whatever I do, I cannot seem to avoid self intersecting geometry from being generated.
I fiddled with the order of modifiers and solidify parameters, to no avail.
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First thing, move the Solidify mod above the Sub-D mod, then change the settings in the Solidify mod to "Edge Data -> Rim -> 1.0" And check your crease values, there are a few of them, especially around that corner, that are not 1.0, this will screw up the Edge Data.
This will fix most of the problem.
After that, there will be a small issue left that is caused by the edges near that corner being a smaller distance away from the corner than your solidify value (1mm) This means that when Blender tries to offset them, they overlap. Simply move them away a little to fix the corner. Use GG to slide them away.
Remember, Blender is not CAD! There are a whole different set of rules to learn and follow! :)