Non manifold edges

I’m a newbie to 3D printing. Downloaded an Stl file, am getting nonmanifold edges. Only PC bambu studio can fix automatically. Naturally I have a mac. Can anyone explain what I need to fix? I know I can create a PC on the mac, want to understand manifold edges.


Non-manifold geometry is defined as any edge shared by more than two faces. This can occur when a face or edge is extruded but not moved, which results in two identical edges directly on top of one another.

So basically you have overlapping edges that cannot be printed.

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Thank you. I would never have guessed that meaning.

After importing a car model exported from Archicad in STL file format, I encountered the same error message. I have a partial understanding of the issue, but could you kindly explain the possible reasons behind the absence of layers in the preview model?