If you’ve spent any time pushing polygons in SketchUp, you’ve likely encountered the infamous Round Corner Crack. You’ve just used Fredo6’s brilliant Round Corner extension to soften a sharp edge, but instead of a beautiful fillet, your model looks like the Grand Canyon has opened up along the seam.
SketchUp has difficulty creating very tiny faces (under roughly 1/16th of an inch). When you use an extension like Fredo6’s RoundCorner on a small object, the resulting arcs generate tiny segments that the software cannot bridge, leading to visible gaps or "cracks" in the mesh. Common Causes sketchup round corner crack
The Round Corner extension (by Fredo6) is a lifesaver for 3D modelers, allowing you to instantly bevel and fillet edges. However, many users encounter a frustrating paradox: when trying to smooth a corner, the extension creates visible cracks, holes, or inverted faces, or simply crashes with a "Triangulation Error." The Truth About the "SketchUp Round Corner Crack":
SketchUcation ExtensionStore: Required for managing and validating your licenses. Free Alternatives to RoundCorner Work clean: Always use Window > Model Info
Window > Model Info > Statistics > Fix Problems before rounding.