To help me tailor advice for your specific project, tell me:
Turn on Hidden Geometry ( View > Hidden Geometry ). Look for hidden diagonal dashed lines on your top face. Erase them if they are unnecessary, or use the Extension Warehouse tool CleanUp³ by ThomThom to optimize the face.
If your corner radius offset is set larger than the available edge length of your tabletop, the algorithm will cause intersecting faces to "eat" into each other. This causes the geometry to fold in on itself and crack the top surface.
Hidden lines or stray geometry intersecting the corner will confuse the plugin's calculation path, causing the top surface to delete itself. How to Fix the "Round Corner Crack Top" Error sketchup round corner crack top
When in doubt, scale up (to give math room) and increase segments (to smooth the math). Do not fight the crack; engineer your workflow to avoid it.
Often, the crack isn't a hole; it's a hidden edge or a reversed face. Zoom into the crack top.
High segment counts create smoother curves but result in smaller, more complex geometry. Drop your segments down (e.g., from 6 to 3 or 4). You can soften the edges later using SketchUp’s native Soften/Smooth Edges tray. To help me tailor advice for your specific
What is the of the object you are rounding?
If the crack only happens on one specific corner, you can patch it manually. Turn on ( View > Hidden Geometry ). Select the Line tool ( L ) .
To never see the "SketchUp round corner crack top" again, you must change your workflow. If your corner radius offset is set larger
Most users searching for this term are looking for the popular RoundCorner extension by Fredo6 . This tool allows you to round the edges and corners of 3D shapes along a 2D profile.
Sometimes the face exists, but it is reversed (blue instead of white). Right-click the area > .
What is the you are trying to round?
Use the to draw lines across the open holes, connecting the broken vertices. SketchUp will automatically heal and skin over the missing faces once a closed loop of three or more coplanar edges is formed.
If a minor crack still appears on an otherwise perfect model, you can manually patch it. Activate the . Trace over one of the open boundary edges along the crack.