Zero-thickness geometry (also known as non-manifold geometry) exists when edges or vertices in a solid model do not properly connect with adjacent geometry. Every edge of a solid body must have exactly two adjacent faces. SOLIDWORKS does not allow zero thickness geometry because it can lead to mathematical problems and downstream errors in the model.
Every edge of a solid body must have exactly two adjacent faces.
Edge where zero thickness geometry is located.
Vertices where zero thickness is located.
Tangent line where zero thickness is located.
Zero thickness occurs when you attempt to extrude a cut tangent to a hole.
This is frequently the cause of failed section views in drawings.
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