In this part, we will cover how to apply the shell feature. We will apply the Shell command to create the following model. You can download the model with the package provided with this chapter. Alternatively, you can create the model from scratch. Note that this is a continuation of the previous model. The thickness of the wall is 3 mm as highlighted in the review cloud in the drawing:

To create the highlighted shell, we use the following steps: 

1. Download and open the model for this exercise. The model is as follows: 

2. Select the Features command category, then select the Shell command as highlighted in the following screenshot:

3. Adjust the PropertyManager options and selections to match the parameters highlighted in the screenshot:

Here is a brief description of some of the options:

• Faces to Remove: This is the field below the thickness of the draft. The faces we select here will be removed after we apply the shell. If we leave this field empty, the model will still be shelled from the inside; however, the outer surface will be unchanged.
• Shell outward: This will flip over the shell direction. In other words, the current model will be removed and replaced by a shell starting from its outer surface. You can give it a try to figure out the effect. 
• Multi-thickness Settings: This will enable us to have different wall thicknesses on different sides. We will cover that in this section. 

4. Click on the green checkmark to apply the shell. Our model will look as shown in the screenshot:

This concludes this section on applying a unified shell using the shell feature. Next, we will cover a special condition where we will specify different thicknesses to different sides.