As a mechanical designer working extensively with complex injection-molded plastics for the past 15 years, dealing with massive fillet operations (often involving hundreds of edges for draft angles and mold release) is a daily routine. However, there is a fundamental flaw in how Inventor provides visual feedback during this process. Currently, when selecting multiple edges for a fillet, Inventor highlights all selected edges in the chosen active selection color (e.g., Pink). If one or several of those edges fail mathematically—due to micro-segments, overlapping geometry, or tight corners — the preview still shows the failing edges as highlighted in the exact same selection color. Inventor’s ShapeManager clearly knows which edges are failing in the background, but the UI visually "lies" to the user by keeping them the same color as the healthy edges. As demonstrated in my attached screenshots: Image 1: Shows a successful selection of multiple edges (all Pink). Image 2: Shows the same selection, but with an added edge that will crash the fillets. Notice how all edges, including the failing one, are still perfectly Pink. Image 3: After clicking OK, the error dialogue informs me that "9 of the 455 selected edges cannot be blended". The Current Workaround: We all know the workarounds. We use "Accept successful blends" to push the feature through and then manually hunt down the remaining sharp edges, or we divide the selection into dozens of smaller edge sets. But these are tedious workarounds for what should be basic UI feedback. The Solution: Please introduce real-time color-coding for failing edges during the active Fillet command. If an edge fails the mathematical calculation, its selection highlight should immediately turn RED (or a specific user-defined error color) directly in the canvas. Stop forcing users to play detective. Let the software visually flag the exact edge that is causing the problem before we even hit "OK". This minor UX adjustment would save an enormous amount of troubleshooting time for anyone working with complex surface geometry. Best regards Filip
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