Laser cutting SVG preflight for small production shops
Check SVG files before laser cutting for duplicate paths, open contours, kerf, scale, operation colors, tiny features, and material-test requirements.
Quick answer
Before laser cutting, confirm physical dimensions, remove duplicate lines, close intended contours, map colors to operations, and test small features against the material. Apply kerf compensation according to the joint or fit strategy rather than offsetting every path automatically.
Appearance is not machine geometry
A browser fills shapes and can hide overlapping edges. Laser software follows paths, including invisible duplicates and short fragments. One visually clean line may contain several stacked paths that cause repeated cutting and excess heat.
| Preflight check | Why it matters | Typical symptom |
|---|---|---|
| Duplicate paths | Machine repeats the same movement | Burned edges or excessive cut time |
| Open contour | Part may not separate or fill correctly | Small uncut bridge or failed offset |
| Physical scale | Import units can differ | Part is far too large or small |
| Tiny segments | Head changes direction repeatedly | Rough curves and slow jobs |
| Operation mapping | Cut, score, and engrave need separation | Wrong power applied to artwork |
| Kerf strategy | Beam removes material width | Loose or impossible joints |
Clean raster-derived paths
Raster tracing can create a path on both sides of every line. That may be correct for a filled silhouette and wrong for artwork meant as a single scored centerline. Decide whether the source represents an area, an outline, or a toolpath before conversion.
Use the laser cutting vectorizer for bold raster artwork, then review the result in the cut file checker.
Separate operations deliberately
Many laser workflows map stroke colors or layers to cut, score, and engrave settings. Use a documented palette and clear layer names. Include a visual reference so an operator can recognize a mistaken mapping before starting the job.
Common operation groups include:
- Outer cut contours
- Interior cutouts
- Fold or score lines
- Vector engraving paths
- Raster engraving regions
- Registration or alignment marks
Remove construction geometry that should not reach the machine.
Handle kerf according to fit
Kerf is the material removed by the beam. Its effective width changes with material, focus, power, speed, air assist, and optics. Measure it with the actual setup.
Compensation depends on the goal. A decorative outline may not need an offset. A press-fit finger joint needs a controlled relationship between tab and slot. Applying a generic outward offset to every contour can alter holes and mating parts in the wrong direction.
Generate a material test card before committing expensive stock, and record the settings with material name and thickness.
Check feature survivability
Narrow bridges can char or break. Closely spaced paths can overheat. Small loose islands may fall through a honeycomb bed. Review the SVG at physical size and inspect the machine preview.
For each critical feature, ask:
- Is it wider than the measured kerf with a practical safety margin?
- Will adjacent cuts concentrate heat?
- Can the part remain supported during the job?
- Does the cut order protect small internal details?
Final shop checklist
- Units and overall dimensions are confirmed.
- Intended closed contours are closed.
- Duplicate paths and hidden fragments are removed.
- Cut, score, and engrave groups are explicit.
- Kerf compensation matches the tested material and fit.
- A low-cost sample has been run before batch production.
Keep the approved vector and the tested machine settings together. Reusing geometry without its process context invites avoidable production variation.