Surface untrim is an undo command specific to the operations performed using the surface trim command discussed in the previous section. To initiate the surface untrim command, you can type SURFUNTRIM (or just use the short version and type SURFUN) and then press Enter. Alternatively, the Untrim surface tool button is located in the Create panel on the Home tab in the 3D Basics workspace:

If you are using the 3D Modeling workspace, you can find it in the Edit panel on the Surface tab.

As the name suggests, if you have a surface that was cut using the surface trim command, you can undo the trimming using the surface untrim command, as shown in the following example:

1. Start the surface untrim command.
2. Select the edges of the trimmed part, as shown in the diagram.
3. Press Enter to end the selection stage. The trimmed part will be restored and the command terminates.

The following diagram is an illustration of the previous steps:

The surface untrim command has one option that allows you to select the surface instead of the edge of the trimmed part, as shown in the previous example.

We have now learned how to create a surface fillet, and how to trim and untrim a surface. Now, let's have a look at another surface editing tool called the sculpt command.