Sketchup solid subtraction subtracts an unwanted piece

[Nanoporous]

I have no idea why this one fails to work. Attached a screen record.
I promise i selected two solids to do the subtraction, and after that, the resulting object is no longer a solid, when I look carefully, I saw there is an opening in an unrelated area, making the geometry not dense anymore:
https://drive.google.com/file/d/1bqjdEAc4QHdDXUhFeM7NpLFp4qQELJ4J/view?usp=sharing

Any suggestions? All comments appreciated!

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10-14 morning version.skp

[Rich O Brien]

Scale everything up by x100 and run the boolean then scale it back down.

SketchUp doesn't like small faces. I don't mean kids. I mean geometry that is tiny....

[Nanoporous]

is one meter cube considered small in sketch uP.?

[Rich O Brien]

No, but you have geometry thats <1mm in places. Scaling fixes it.