How can I repair this mesh?

@ShynnSup wrote:

Hello people,

I have got a simple model of stacked boxes and I intend to print it in 3d.
So I made a boolean union and exported a stl. Thing is that when I open and check the file, it has about 432 non manifold edges.

I then delete these edges but the result is a mesh full of holes. The been trying the commands recommended to solve these issues, but dont, the mesh holes are too big and too many,

Any ideas on how can I solve this?
Thanks

Mesh.png1099x563 179 KB

Mesh.3dm (1.1 MB)

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