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 From the 3D Printing section, click Tessellation
       .Select the surfaces to tessellate.  
      Click Apply.Modify the  Sag value, that is the maximum distance between the geometry and the triangles.Select the  
      Step check box to control 
      the length of triangles. 
      Select an output option: Distinct creates separate 
        tessellations, i.e. one tessellation for each input element. The names 
        of those tessellations contain the names of the input elements, e.g.
        Tessellation (Part1-Revolute.1).1. Grouped creates one 
        multi-cell tessellation, named Tesselation.x. The number of 
        cells corresponds to the number of input elements.
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