If you have landed on this page, you have likely stared at your screen in frustration. You’ve just applied a beautiful圆弧 (round corner) using Fredo6's Round Corner plugin (or the native Follow Me tool), only to zoom in and discover a disaster: a , a missing face, or a jagged "non-manifold" gap right at the top of your geometry.
To resolve the issue of a crack or gap at the top of a rounded corner in SketchUp, try the following solutions: sketchup round corner crack top
If you need a perfectly smooth, crack-free top (like a car fender), stop using Round Corner for the top vertex. Use or SubD (Subdivision) . If you have landed on this page, you
The "top" of an object is vulnerable because it is often a (a face with more than 4 sides). When the rounding algorithm hits a complex ngon at the top, combined with a sharp curvature, the calculations fail to stitch the mesh closed. Use or SubD (Subdivision)