By default, rounding tools generate a high number of segments to make a curve look perfectly smooth. However, on tight corners or complex intersections, too many segments force the generation of microscopic polygons. Try lowering the segment count in the RoundCorner parameters panel from 6 down to 3 or 4. At small scales, the visual difference is negligible, but it drastically prevents mesh cracking. Part 3: Modern Alternatives to Fredo6's RoundCorner
For small, isolated cracks, manual repair is fast and effective.
If the faces you are rounding are inside-out (blue instead of white), the plugin may render the rounded corner inside-out or broken. How to Fix Round Corner Cracks (Troubleshooting Steps)
: If the edges being rounded are not perfectly aligned or if the faces are slightly "off-plane" (even by a thousandth of a foot), the tool may create fragmented, "cracked" surfaces instead of smooth ones. sketchup round corner crack
If you have ever used SketchUp plugins like Fredo6's or Corner+ to bevel edges, you have likely encountered the frustrating "round corner crack." This issue happens when the smooth, rounded geometry you create splits, leaves holes, or tears apart from the main mesh. Instead of a clean, manufactured edge, you get a broken model that ruins your renders and disrupts 3D printing.
If you are not ready to pay for a license, there are several free and legal ways to round corners in SketchUp. 1. Manual Techniques (No Plugins)
SketchUp is a polygonal modeler that struggles with incredibly small faces. When you attempt to round an edge with a small radius (e.g., a 2mm fillet on a tiny product design), the resulting geometry requires faces smaller than SketchUp’s internal tolerance limit (roughly 1/100th of an inch). When a face falls below this threshold, SketchUp fails to create it, leaving an open "crack" or hole in your mesh. Here is how to fix and prevent geometric tearing: 1. The "Dave Method" (Scale Up, Scale Down) By default, rounding tools generate a high number
Run the plugin on the large version. SketchUp will easily geometry-fill the large faces.
If you've tried a cracked version, you've likely seen one or more of these specific failures:
Ensure that the edges you are selecting form a clean, continuous loop. At small scales, the visual difference is negligible,
RoundCorner requires clean topology to calculate edge offsets properly. If your model contains internal stray lines, duplicated faces, or reversed faces, the plugin will lose its calculation path and tear the mesh.
SketchUp Round Corner Crack: Risks, Legal Alternatives, and Best Plugins
