The shell tool hollows out a part, leaves open the faces you select, and creates thin-walled features on the remaining faces. If you do not select any face on the model, you can shell a solid part, creating a closed, hollow model
. You can also shell a model using multiple thicknesses.
You should apply any fillets before you shell a part.
If the Shell tool has problems shelling a model, the Error Diagnostics section appears in the PropertyManager to help you diagnose the problem.
To create a shell feature of uniform thickness:
Click Shell on the Features toolbar or Insert, Features, Shell.
In the PropertyManager, under Parameters:
When you shell a multibody part, the Solid Body box appears. After you select a face to remove, or a body, the box disappears.