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Select your group, run the tool, and see if it reports "Reversed Faces" or "Internal Face Edges." Click Fix All .
: Select your object and turn it into a component.
If Fredo6 Round Corner consistently cracks your top geometry, switch to these alternatives:
If you prefer not to use extensions, you can use the tool: Curved face problem - SketchUp Forums
SketchUp uses a polygonal modeling engine. It struggles with microscopic geometry and complex vertex merges. When a rounding plugin fails to patch the top face cleanly, it is usually due to one of three common triggers. 1. The Scale Limitation (The Tiny Face Issue)
The "top crack" issue in SketchUp's RoundCorner extension usually results from geometry scale, non-planar surfaces, or interrupted loops. Solutions include scaling the object up before rounding, manual face healing, or checking for hidden, problematic geometry. All the Ways to PATCH HOLES in SketchUp!
Go to View > Hidden Geometry . You may find that the "crack" is actually an unsoftened edge or a missing tiny triangle. Use the Line Tool to manually stitch the gap, then use the Eraser Tool + Ctrl to soften the new edge.
Test the geometry. Fewer segments mean larger individual faces, which prevents SketchUp from dropping tiny polygons. Method 3: Clean the Top Surface Mesh
After investigating user reports and the tool's mechanics, the "crack" is usually caused by one of three specific failures:
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