If your RoundCorner plugin is leaving "cracks" or broken geometry on the top face of your SketchUp model, it’s usually due to tiny geometry errors or a conflict with the rounding algorithm. Quick Fixes for "Cracked" Faces
3. Repair After Generation If the crack appears but the model is otherwise correct: sketchup round corner crack top
The "crack top" issue usually stems from one of three problems: If your RoundCorner plugin is leaving "cracks" or
Instead of a smooth, closed box, you are left with a model that looks like the top was ripped open. Fix: Update the plugin via the Extension Manager
When to Accept the Crack If the model is strictly for 3D printing or rendering (not for structural editing), a minor top crack is often harmless. Use Solid Inspector (by ThomThom) – if the crack is a hairline and doesn't create a hole, the object remains a "solid group" and prints fine.
TL;DR: Reduce your radius by 20%, turn on "Soften Edges," and you’ll have a render-ready model in seconds.