I have a single sketch with multiple vertices and faces. Once I select one face, and press A to select all faces and extrude, the extrusion happens but the volume in between is not filled. The reference photos are attached:
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1 Answer
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Your mesh has been extruded already. I mean, you pressed E to extrude then canceled the operation, but when you cancel "extrude and move" you cancel only "move", but not "extrude". So you have 2 copies of vertexes that exactly overlap each other.
Simplest way to fix this - select all, then press M -> By distance. It will remove overlapping vertexes and only clean geometry will be left
