When is something considered a solid

I am trying to use the subtract tool and i keep getting a message saying the part is not a solid. do i have to group, make a component or other?

You need to have groups or components that SketchUp indicates are solid. In simple terms a solid is a component or a group in which every edge is share with exactly two faces. No more and no less. So no stray edges, no holes in surfaces, and no internal faces.


thank you for the info

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