Hi Defonten, I took a look at your model. It's a mixture of some open surfaces and some solids. If you hide the solids and leave only the open surfaces (you can do this by going to the "Types" section of the scene browser and clicking the eye icon on the "Solids" entry there), you'll see these are the open surfaces:
These pieces all appear to touch each other edge-to-edge so this is possibly the result of running Edit > Separate on something?
You can select all them and use Edit > Join to glue them together at their touching edges. If you then run the script from the link above you'll see there is still an open edge here:
So the bottom surfaces appear to be missing.
- Michael
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