A shell feature is a pick and place feature that creates a hollowed out solid with a specified wall thickness.
Note: The pick and place features (same as chamfers, rounds and holes) means that the shape of the feature is implied - you are not required to sketch the section. Pick and place features can be added once the model’s shape has been created.
You can create two types of shells:
• Open Shells (example in this video tutorial)
• Closed shells (create base geometry and apply Shell feature)