The 3D Printer G-Code Layer & Retraction Travel Path Analyzer renders slicing toolpaths, rapid non-print travel moves, and extruder retraction points directly on an interactive canvas.

### Toolpath Visualization Architecture The visualizer models toolhead kinetics across a calibrated 540×400 print bed grid: - **Layer-by-Layer Navigation**: An interactive layer slider scrub tool paths through 65 vertical slicing cross-sections. - **Perimeter Toolpaths (G1)**: Emerald green contours depict continuous outer wall and infill filament deposition coordinates. - **Rapid Travel Vectors (G0)**: Cyan travel lines highlight non-extruding print head movements across open bed spans. - **Retraction Markers**: Amber indicator nodes flag extruder retraction and unretraction events to diagnose stringing hazards and travel seams. - **Diagnostic Toggles**: Real-time switches allow hiding or displaying travel moves and retraction markers to isolate clean print contours.

### Practical Troubleshooting Workflow Diagnosing stringing and surface zits on a complex 3D printed mechanical enclosure: 1. Adjust the **Active Layer** slider to inspect layer 14 where infill meets outer wall shells. 2. Toggle **Show Travel Moves** to trace head path trajectories across inner cavities. 3. Toggle **Show Retractions** to verify that the slicer placed seam retractions within infill rather than along visible external perimeters. 4. Use the visual toolpath breakdown to optimize retraction distance and z-hop settings in your slicer.

### In-Browser Processing & Privacy Note All toolpath coordinate parsing and canvas rendering execute entirely in local browser memory. No 3D model files, proprietary G-code files, or slicing settings are uploaded to any remote server.