Once you have given the mesh some depth, it is important to check and make sure there is no intersecting geometry, or thin sections that may be flimsy or not print at all.
You can use ALT+B to slice open the mesh and see inside of it.
Here you can see a part of the inside that's sticking through the outside. I'll need to fix this by deleting faces and moving things around.
This part is also very thin and might not print well.
You can also switch the view to wireframe mode, to make everything transparent.
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