--- title: How to Use the Radius/Fillet Tool in LightBurn description: Learn how to use the Radius/Fillet tool in LightBurn to round, modify, or remove corners. Perfect for creating smooth transitions, rounded details, and complex shapes. --- [Skip to content](https://support.salasers.com/radius-fillet-tool-lightburn#main-content) English Show submenu for translations [Submit a Ticket](https://support.salasers.com/kb-tickets/new?hsLang=en) ![MicrosoftTeams-image.png\]](https://support.salasers.com/hs-fs/hubfs/Logos/MicrosoftTeams-image.png?height=50&name=MicrosoftTeams-image.png) Open main navigation Close main navigation - English Show submenu for translations - [Submit a Ticket](https://support.salasers.com/kb-tickets/new) - Go to salasers.com Go to salasers.com Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [SA Laser Knowledge Base](https://support.salasers.com/?hsLang=en) 2. [Tools & Features](https://support.salasers.com/tools-features?hsLang=en) 3. [Layout and Design](https://support.salasers.com/tools-features?hsLang=en#layout-and-design) # How to Use the Radius/Fillet Tool in LightBurn ## Round, Remove, or Modify Corners with Precision ### ![QuickRef-RadiusFillet](https://support.salasers.com/hs-fs/hubfs/QuickRef-RadiusFillet.gif?width=688&height=516&name=QuickRef-RadiusFillet.gif) ### What Is the Radius/Fillet Tool? The Radius/Fillet tool in LightBurn is used to round sharp corners, take a "bite" out of corners with a negative radius, or revert rounded corners back to sharp ones. This versatile tool can be applied to various shapes and paths, offering precision and flexibility for your designs. --- ### Location **Modifiers Toolbar:** Radius/Fillet Tool --- ### Applications - **Smoother Appearance:** Round sharp corners for a softer look. - **Complex Shapes:** Create varied, intricate designs with custom radiuses. - **Assembly-Friendly Tabs:** Round corners to make assembly easier. - **Decorative Elements:** Add rounded details for aesthetic appeal. --- ### How to Use the Radius Tool ![Ref-Radius-InModifiersToolbar](https://support.salasers.com/hs-fs/hubfs/Ref-Radius-InModifiersToolbar.png?width=544&height=49&name=Ref-Radius-InModifiersToolbar.png) 1. **Activate the Tool:** - Select the Radius Tool icon from the **Modifiers Toolbar**. 2. **Set the Radius Value:** - Enter the desired radius size. Ensure there’s enough space for the radius to fit between the corner and adjacent points. - For a unique effect, use a negative radius value to create a “bite” in the corner. ![Ref-Radius-AddToPath](https://support.salasers.com/hs-fs/hubfs/Ref-Radius-AddToPath.gif?width=459&height=250&name=Ref-Radius-AddToPath.gif) 3. **Apply the Radius:** - Select the object you want to modify. - Hover over a corner. The cursor changes to indicate if the radius can be applied: - **![Icon-Cursor-Radius-Add](https://support.salasers.com/hs-fs/hubfs/Icon-Cursor-Radius-Add.png?width=32&height=32&name=Icon-Cursor-Radius-Add.png) Fillet Corner:** Ready to apply the radius. - **![Icon-Cursor-Radius-Remove](https://support.salasers.com/hs-fs/hubfs/Icon-Cursor-Radius-Remove.png?width=32&height=32&name=Icon-Cursor-Radius-Remove.png) Remove Fillet:** Corner can be reverted to sharp. - **![Icon-Cursor-Radius-NotEnoughRoom](https://support.salasers.com/hs-fs/hubfs/Icon-Cursor-Radius-NotEnoughRoom.png?width=32&height=32&name=Icon-Cursor-Radius-NotEnoughRoom.png) Not Enough Space:** Radius cannot be applied. - Click the corner to apply the radius. 4. **Exit the Tool:** - Press **Esc** to exit the Radius Tool. --- ### Removing or Modifying a Radius - **Remove a Radius:** - Click on an existing rounded corner to revert it to sharp. - This works even for imported designs, provided the software used exported actual arcs. ![Ref-Radius-RemoveAndEdit](https://support.salasers.com/hs-fs/hubfs/Ref-Radius-RemoveAndEdit.gif?width=460&height=350&name=Ref-Radius-RemoveAndEdit.gif) - **Change a Radius:** - Remove the current radius and reapply a new radius with the desired size. --- ### Special Features #### **Rectangles and Radius Handles:** - Use the **Shape Properties Window** to adjust rectangle corners. This ensures consistent corner radiuses when resizing the rectangle. - Hold **Ctrl/Cmd** while selecting a rectangle to reveal blue corner radius handles. - **Drag Outward:** Increase corner radius. - **Drag Inward:** Decrease radius. - **Drag Vertically:** Create a reversed radius (“bite” effect). ![Ref-Radius-AddToRectangle-1](https://support.salasers.com/hs-fs/hubfs/Ref-Radius-AddToRectangle-1.gif?width=550&height=350&name=Ref-Radius-AddToRectangle-1.gif) --- ### Troubleshooting **Common Issues and Solutions:** 1. **Radius Tool Doesn’t Work:** - Ensure shapes are **Ungrouped**. - Verify the **Radius Tool** is active and the object is selected. ![Icon-Cursor-Radius-NotEnoughRoom](https://support.salasers.com/hs-fs/hubfs/Icon-Cursor-Radius-NotEnoughRoom.png?width=32&height=32&name=Icon-Cursor-Radius-NotEnoughRoom.png) 2. **Not Enough Space for Radius:**  - Check if the corner has sufficient room for the radius. - If lines at the corner aren’t joined: - Use the **Edit Nodes Tool** to adjust and snap them together. 3. **Trouble Reverting to Sharp Corner:** - Imported arcs may appear as tiny lines. Use **Optimize Selected Shapes** to recover true arcs. --- ### Practical Tips - **Consistent Design:** Use the Shape Properties Window for uniform radiuses, especially in rectangles. - **Visual Cues:** Pay attention to cursor icons when hovering over corners for clear guidance. - **Custom Effects:** Experiment with negative radius values for decorative “bite” effects. The Radius/Fillet tool enhances your designs by enabling smooth transitions, creative corner effects, and precise modifications, perfect for both functional and decorative applications. - [Lightburn](https://support.salasers.com/lightburn?hsLang=en#main-content) - [Lightburn For Galvo (Fiber)](https://support.salasers.com/lightburn?hsLang=en#lightburn-for-galvo-fiber) - [Lightburn For Gantry (Co2,RF)](https://support.salasers.com/lightburn?hsLang=en#lightburn-for-gantry-co2rf) - [Fiber (Galvo) Lasers](https://support.salasers.com/fiber-galvo-lasers?hsLang=en#main-content) - [Troubleshooting](https://support.salasers.com/fiber-galvo-lasers?hsLang=en#troubleshooting) - [Co2 Lasers](https://support.salasers.com/co2-lasers?hsLang=en#main-content) - [Razor Series](https://support.salasers.com/co2-lasers?hsLang=en#razor-series) - [Troubleshooting](https://support.salasers.com/troubleshooting?hsLang=en) - [EzCad 2](https://support.salasers.com/ezcad-2?hsLang=en) - [How-To Guides](https://support.salasers.com/how-to-guides?hsLang=en) - [Explainers](https://support.salasers.com/explainers?hsLang=en) - [Tools & Features](https://support.salasers.com/tools-features?hsLang=en#main-content) - [User Interface](https://support.salasers.com/tools-features?hsLang=en#user-interface) - [Essential Functions](https://support.salasers.com/tools-features?hsLang=en#essential-functions) - [Layout and Design](https://support.salasers.com/tools-features?hsLang=en#layout-and-design) # San Antonio Laser SALasers.com Help Center Copyright © 2026, San Antonio Laser