How to Use Fill Surface in SolidWorks: Step-by-Step Guide

In SolidWorks, use the Fill Surface tool to close gaps or holes by creating a smooth surface patch. Select the edges around the hole, then apply Fill Surface from the Surfaces tab to generate a seamless fill.

Syntax

The Fill Surface feature in SolidWorks is accessed via the Surfaces toolbar. The basic steps are:

• Select Edges: Choose the boundary edges around the hole or gap you want to fill.
• Fill Surface Command: Click Insert > Surface > Fill or use the Surfaces toolbar button.
• Adjust Options: Set tangency or curvature conditions to control smoothness.
• Confirm: Click OK to create the filled surface.

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Fill Surface Usage Pattern:
1. Select edges around the hole
2. Insert > Surface > Fill
3. Set tangency/curvature options
4. Confirm to create surface

Example

This example shows how to fill a circular hole on a surface using the Fill Surface tool.

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1. Open your part with a hole on a surface.
2. Switch to the Surfaces tab.
3. Select the edges of the hole.
4. Click Insert > Surface > Fill.
5. In the Fill Surface PropertyManager, set Tangency to 'None' or 'Tangent to Face' for smoothness.
6. Click OK to create the filled surface.
7. Use <code>Thicken</code> if you want to convert the surface to a solid.

Output

A smooth surface patch fills the hole, closing the gap seamlessly.

Common Pitfalls

• Not selecting all boundary edges: Missing edges can cause the fill to fail or create an incomplete surface.
• Incorrect tangency settings: Using no tangency on curved surfaces can cause sharp edges or visible seams.
• Complex boundaries: Very irregular or non-planar edges may cause the fill to fail or produce unexpected shapes.
• Trying to fill very large holes: Fill Surface works best on small to medium gaps; large holes may need different modeling techniques.

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Wrong way:
- Select only some edges
- Click Fill Surface
- Result: Error or incomplete fill

Right way:
- Select all edges around the hole
- Set appropriate tangency
- Confirm fill surface creation

Quick Reference

Step	Action	Tip
1	Select all edges around hole	Use edge selection filters if needed
2	Insert > Surface > Fill	Access from Surfaces toolbar or menu
3	Set tangency/curvature	Choose 'Tangent to Face' for smooth blends
4	Confirm fill	Check surface visually for smoothness
5	Optional: Thicken surface	Convert surface to solid if needed

Key Takeaways

Always select all boundary edges around the hole before using Fill Surface.

Adjust tangency or curvature options to ensure a smooth surface blend.

Fill Surface works best for small to medium holes on surfaces.

Use the Surfaces toolbar or Insert menu to access Fill Surface quickly.

Check the filled surface visually and use Thicken if you need a solid body.