Never round a corner on an unsmoothed, high-poly mesh. Always Simplify, Scale, Round, Scale Back.

Do not drag and drop files into folders. Follow this exact order to ensure all dependencies are met: sketchup round corner crack

The most difficult geometry for SketchUp's native tools to handle is often geometry you didn't create yourself, particularly from imported CAD files or STL files. CAD files are often riddled with tiny, unconnected segments, stray lines, and faces that are not properly united. When you import such a file and apply RoundCorner, the plugin will try to work with every single one of those messy, unoptimized edges, inevitably creating a fractured, cracking result. Never round a corner on an unsmoothed, high-poly mesh

Scale the group back down. This allows SketchUp to handle small faces without creating degenerate edges. 3. Use "Check Geometry" in the Plugin Follow this exact order to ensure all dependencies