Creates a filleted surface between two other surfaces.
The fillet surface has a constant radius profile and is tangent to the original surfaces. The original surfaces are automatically trimmed to connect the edges of the fillet surface.

The following prompts are displayed.
- First and Second Surface or Region
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Specifies the first and second surfaces or regions.
- Radius
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Specifies fillet radius. Use the Fillet grip or enter a value to change the radius. You cannot enter a value that is smaller than the gap between the surfaces. If no radius value is entered, the FILLETRAD3D system variable value is used.
- Trim Surface
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Trims the original surfaces or regions to the edges of the fillet surface.
- Expression
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Enter a formula or equation to specify the fillet radius. See Constrain a Design with Formulas and Equations.