I'm having a really hard time making this solid. Can someone please help me and point out my mistakes?

magnet2.skp (1.0 MB)

Help me make this object solid. This is my first time using SketchUp, and I keep searching for solutions, but I think it’s best if someone can assist me

Inside the group you have another group and a bunch of loose geometry.

In order for the object to be consider solid you need to explode the group inside the top level.

BTW, the lid for your box has all the faces reversed. If you plan to 3D print that you need to correct the face orientation. The blue back faces point toward the print media.

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thanks a lot!!!

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