modeling - Shadows along edges of mesh in 3D View - Blender Stack Exchange

I have recently started using blender and one of the models I'm working on has dark shadows along edges. I started this model from scratch. I can't remember them being there when I first started the

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modeling - Shadows along edges of mesh in 3D View - Blender Stack Exchange

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modeling - Shadows along edges of mesh in 3D View - Blender Stack Exchange

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