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The "crack" appears when the math breaks down. Common causes include:
If you are searching for a "crack" for the Round Corner plugin (now largely succeeded by FredoCorner sketchup round corner crack
If you are on a budget, you don't need a crack to get rounded edges: The Follow Me Tool (Built-in) The "crack" appears when the math breaks down
If you’ve ever tried to soften the edges of a 3D model only to find your geometry "cracking" open or leaving empty holes, you aren’t alone. In SketchUp, rounding corners is a classic challenge that often leads to jagged edges, missing faces, or the dreaded plugin crash. you aren’t alone. In SketchUp