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Overhang warnings on top not bottom?

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You model is inverted (inside-out).

In .stl, walls have faces (inside and outside).

Your model has been inverted (inside faces are facing out, outside faces are facing in).

If you load your model into an editor (like Sketchup), it will show outside faces in white and inside faces in grey. I'm betting your model is all grey on the outside.

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