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Note the preview is not accurate and warnings may not indicate real issues.
Face ‣ Solidify Faces
This takes a selection of faces and solidifies them by extruding them uniformly to give volume to a Non-manifold surface. This is also available as a Modifier. After using the tool, you can set the offset distance in the bpy.ops.screen.redo_last panel.
Amount to offset the newly created surface. Positive values offset the surface inward relative to the normals direction. Negative values offset outward.