You can remove details, fill voids, and define envelopes.
Use the Simplify tools to reduce model complexity or to replace intellectual property with simple shapes.
Use Remove Details to remove recognized fillets, chamfers or custom-selected faces.
You must have one or more solid bodies in the file to use the tool.
 Simplify panel
 Simplify panel  Remove Details
 Remove Details  
  to finish.
to finish. Use Fill Voids to remove any internal spaces of the geometry.
 Simplify panel
 Simplify panel  Fill Voids
 Fill Voids  
  to apply and continue.
 to apply and continue.  to finish.
 to finish. Use Define Envelopes to reduce geometric complexity or remove intellectual property from the interior or exterior a part.
 Simplify panel
 Simplify panel  Define Envelopes
 Define Envelopes  
  Select the Simple Shape - choose from Bounding Box or Bounding Cylinder.
 Select the Simple Shape - choose from Bounding Box or Bounding Cylinder.  Select the Faces defining the bounding area.
 Select the Faces defining the bounding area.  Choose the method of creation - join to an existing solid or create a new feature.
Choose the method of creation - join to an existing solid or create a new feature.  to apply the change and continue.
 to apply the change and continue.  to finish.
 to finish. The simplified envelopes populate the browser.