Check the quality of part facets.
        
        - 
                On the Project Tree, click on
                    the Assembly workbench.
            
 
- 
                On the Assembly workbench toolbar, click 
 (Check geometry defects).
             
- 
                Click the Geometry defects tab.
                
The dialog will list any boundary segments, non-manifold segments, or
                    orientation segments found.
             
- 
                Click Close.