Can't Use Extrusion and Symmetry On the Same Design Space

Condition

I cannot use Extrusion and Symmetry shape controls on the same design space.

Cause

These two types of shape controls are not compatible.

Remedy

  1. Split the design space part along the symmetry plane.
  2. Delete the symmetric portion.
  3. Use the Instance option on the Mirror tool's guide bar to create a symmetric copy.
  4. Apply an Extrusion shape control to one of the parts. (The same shape control will be applied to the other instance).
    The optimization results will be both symmetric and extrudable.