The designer had previously drawn a center guide line across the top face (to align leg holes). That guide line was a hidden, un-deleted edge. The Round Corner tried to round across that internal edge, creating a crack.
tool method for rounding corners without using any external plugins? AI responses may include mistakes. Learn more sketchup round corner crack top
I have written two versions depending on the exact nature of your problem. The designer had previously drawn a center guide
When you apply a RoundCorner (Fillet) operation to a shape—specifically a box or rectangle—the plugin successfully rounds the vertical edges. However, users frequently report that the or creates a jagged hole/crack right in the center of the face or at the corners. tool method for rounding corners without using any
: To function, it requires the installation of the LibFredo6 shared library and the SketchUcation ExtensionStore.
If you'd like, you can upload a screenshot of your model or describe the (concave or convex) so I can give you more specific repair steps. Fredo6 Round Corner - Face becomes two tones - Extensions