Introduction
Laser cutting jigsaw puzzles is satisfying — but only if the SVG is set up correctly. The two things that decide whether pieces fit are material and kerf, so plan around those before you generate anything.
Step 1: Start from the material, not the art
Different materials tolerate different piece geometry:
- 3 mm plywood: forgiving, best for first prototypes
- 4–5 mm plywood / MDF: stronger, but needs larger tabs
- Acrylic: crisp edges, but fragile with tiny connectors
- Cardboard / chipboard: low kerf risk, good for print-and-cut
If the material is thick or brittle, reduce the piece count and avoid narrow necks in the tabs.
Step 2: Set canvas size and piece count
Match the canvas to your material (e.g. 300 × 200 mm for a plywood sheet) and leave a small margin so the frame isn't clipped. More pieces mean smaller tabs and tighter tolerance. Practical starting points:
| Use case | Size | Pieces | Pattern |
|---|---|---|---|
| First prototype | 300 × 200 mm | 120–160 | Grid |
| Gift puzzle | 350 × 250 mm | 180–260 | Voronoi |
| Small-batch sale | 400 × 300 mm | 220–320 | Grid |
| Display piece | 450 × 300 mm | 250–350 | Voronoi |
Grid cuts faster and validates fit more easily; Voronoi gives a more handcrafted look. See grid vs Voronoi for the trade-offs.
Step 3: Export the SVG
Use the puzzle generator to export. Before importing into your laser software, confirm the units (mm or in) are explicit, paths are clean with no duplicates, and the outer frame is present if you need it for handling.
Open the SVG once before you cut. In LightBurn, Inkscape, Illustrator, or your usual CAM software, check that the file imports at the expected physical size. If a 300 mm file imports as 300 px, stop and fix units before touching the laser.
Also separate visual engraving from cut paths if your project uses artwork. The puzzle outline should be a clean cut layer. Any image, text, or reference mark should be on a separate layer with its own power and speed settings.
Step 4: Calibrate kerf once per material
Most lasers remove 0.1–0.2 mm of material, which makes pieces fit loosely if you don't compensate. Calibrate once and document the value:
- Generate a small 20–30 piece sample
- Cut with default settings
- Test fit: too tight / ideal / too loose
- Adjust kerf compensation in small increments (0.02–0.05 mm)
- Repeat until pieces lock smoothly without force
A 15-minute calibration saves hours of recutting on a production run.
Step 5: Test cut before full production
Cut a small corner or 10–20 pieces first. Assemble pieces from different zones and check tab strength at corners and narrow necks, look for overburn on fine curves, and confirm the outer dimensions match. Only run the full job once the sample passes — then save your working settings (material, kerf, speed, power, piece count) as a preset for next time.
Do not skip the boring notes. Write down the material, thickness, lens, speed, power, passes, kerf value, and whether the fit was tight or loose. Future you will not remember the exact settings two weeks later.
Common mistakes
- High piece count on thick material (weak tabs)
- Forgetting to set units before export
- Skipping the test cut
- Mixing cut and engrave paths on one layer
- Using the same kerf value across different materials
- Choosing a beautiful pattern that has connectors too thin for the stock
When SVG is the wrong format
SVG is the right format when you need editable vector paths. If you just want a file to print yourself, PDF or PNG is usually simpler. If your CNC workflow expects CAD-style data, DXF may be easier to import than SVG.
In other words, choose the export format based on the machine or final use, not because one format sounds more professional. A classroom handout, a laser-cut wood puzzle, and a CNC template have different needs.
Safety and production notes
Check material safety before cutting. Some plastics release harmful fumes and should not go into a laser cutter. If you are unsure, ask the material supplier or the operator of your local makerspace.
For anything you plan to sell or give to children, sand edges, remove smoke residue, and test small pieces for breakage. A clean SVG is only one part of a safe finished object.
