The Create Planar Caps command closes off the ends of open-ended solids by creating planar NURBS surfaces. These surfaces can then be added to the rest of the surfaces with the Add Solids command.
To create planar caps:
Select the open-ended solid.
Select Model > 3D Power Pack > Create Planar Caps.
Planar NURBS surfaces are created to close off the ends of the solid.
If desired, add the solid and the planar cap surfaces by selecting them all and choosing Model > Add Solids.
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