The surface fillet command is very similar to the standard fillet command used in 2D drafting. If you have two surfaces meeting at a sharp edge, you can replace them with a rounded fillet with a given radius using the surface fillet command, as we will see in this section. To start the surface fillet command, you can type SURFOFFILLET (or just use the short version and type SURFF) and then press Enter. Alternatively, the Fillet surface tool button is located in the Edit panel on the Home tab in the 3D Basics workspace, as shown in the following screenshot:

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

Just like the 2D fillet command, the surface fillet command can be used to create a round fillet with a specific radius between two surfaces, as shown in the following example:

1. After starting the surface fillet command, select the first surface.
2. Click on the second surface.
3. You will be prompted to set the fillet radius or change the trim option setting, or you can just skip and press Enter. The fillet will be created and the command terminates.

The following diagram is an illustration of the previous steps:

If you select the fillet surface, you will find a small arrow. You can click and drag this arrow to modify the fillet radius or, alternatively, you can enter a new value for the radius using the keyboard as shown here:

The surface fillet command has a number of different methods/options that appears as a list just before the command terminates. The list contains two options:

• The first option sets the radius of the fillet. To do so, you click on the Radius option and then enter the value of the fillet radius and press Enter.
• The second option is called Trim. This option has two settings – Trim, and No Trim. If you select No Trim, the round fillet will be created, but the surfaces will not be trimmed to the edges of the fillet, as shown in the following diagram:

Let's now have a look at the next command in the surface editing set, which is the surface trim command.