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                From the Idealize section of the action bar, click Thin Parts Attribute
                     .In the Surface box, select the surface.
                In the Thickness 1 and Thickness 2 boxes, enter the input values or change the values using the arrows.
                You can change the Thickness 1 using the arrow on the surface.
                Click  to invert
                    the direction of thickness 1 and 2.Click OK to apply the thickness. Thicknesses 1 and 2 appear in the tree, as the surface's attributes.
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