Invalid Geometry

I keep getting Invalid Geometry alerts when I join my surfaces. Problem seems to occur when I build Edge Curve Surfaces. And as a further result, I’m not able to build and save a sufficient STL file.
Rhino_Geometry_Test.3dm (3.6 MB)
Any help is appreciated, and I’ve included the 3DM file.

The surfaces which are forming the cutouts might be self-intersecting. There are 4 open edges.

The cutouts can be modeled in a better way.

These surfaces here are not good.

What is the requirement for this part? What are the cutouts for?

Thank you Martin for weighing in. For some reason I was not able to locate the bad edges when I did an analysis. The cutouts are merely decorative. I will have another look at a way to complete this without them intersecting one another. Thanks again, Brad

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Hey Martin,

That was it. I was able to decrease the severity of the angles by a large margin, and my edges matched, and I was able to construct a solid STL file for printing.

Thank you very much for your quick response, and your detective work of my file. I hope you have a great weekend!

Brad

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