Laser Cutting Cardboard, Chipboard, and Paper Craft: Settings, Kerf Control, and Fire Safety

Cardboard and chipboard get dismissed as a "test material" — something you burn through while dialing in settings for the real project. That undersells them. Single-wall corrugated, double-wall corrugated, chipboard/greyboard, and mat board are genuinely useful laser materials in their own right: packaging prototypes, architectural and product mockups, cosplay armor cores, greyboard book covers, stage props, and point-of-sale displays are all routinely cut from them in professional shops. They're cheap, laser-friendly, and — unlike plywood or acrylic — forgiving of mistakes, which makes them the right choice for iterating on a design before you commit good material to it. This guide covers cutting and scoring these paper-based materials on a diode laser like the Longer Ray5 20W, including the fire-safety considerations that come with cutting something this combustible.

Know Your Material: Corrugated, Chipboard, and Mat Board Aren't the Same

"Cardboard" covers a wide range of constructions, and each behaves differently under a beam:

Single-wall corrugated — one fluted layer sandwiched between two liners. This is standard shipping-box material. The flute direction matters a lot: cutting parallel to the flutes goes fast and clean, cutting across the flutes takes more power and passes because the beam has to burn through liner-flute-liner-flute-liner in a less continuous path.
Double-wall corrugated — two fluted layers, much thicker and stiffer, used for heavy-duty shipping and structural prototypes. Needs meaningfully more power/passes than single-wall and chars more if you push speed too hard.
Chipboard / greyboard — dense, uniform, non-corrugated pressed board (the stiff grey material inside board-game boxes and hardcover book covers). Cuts more predictably than corrugated because there's no flute direction to fight, but it's denser and needs more power per thickness than corrugated of the same nominal weight.
Mat board / museum board — smooth-faced, uniform core, popular for framing and clean prototype panels. Behaves similarly to chipboard but the smooth facing shows scorch marks more visibly, so masking matters more here than anywhere else on this list.

Settings Reference for the Ray5 20W

These are starting points for a 20W diode laser — always run a test grid on your actual stock, since coating, moisture content, and manufacturer all shift these numbers. See our LightBurn material test grid guide if you haven't set one up.

MaterialOperationSpeedPowerPassesNotes Single-wall corrugated, 3mmCut (with flutes)250-300 mm/min60-70%1Fastest, cleanest cut orientation Single-wall corrugated, 3mmCut (across flutes)150-200 mm/min75-85%1-2Expect more char; consider air assist boost Double-wall corrugated, 7mmCut100-150 mm/min85-100%2-3Let smoke clear between passes Chipboard/greyboard, 1.5mmCut200-250 mm/min60-70%1Very consistent, good for repeat production Chipboard/greyboard, 1.5mmScore/crease (fold line)500-700 mm/min15-25%1Do not cut through — see scoring section Mat board, 1.4mmCut200-250 mm/min55-65%1Mask the face first to protect the finish Kraft paper/cardstock, 0.3mmCut500-800 mm/min15-20%1Very fast — reduce power before speed to avoid tearing

Scoring for Fold Lines: Packaging's Killer Feature

The reason cardboard is so useful for packaging prototyping is that a laser can both cut and score in the same job — score lines become fold lines, cut lines become panel edges and windows, all from one file with no re-fixturing. In LightBurn, set your score lines as a separate layer with much lower power and higher speed than your cut lines (see the table above), and make sure the score layer runs on the correct face — for corrugated, always score with the flutes running perpendicular to the fold, since a fold parallel to the flutes will crack rather than bend cleanly. Run your score passes before your cut passes so the material stays fully supported and flat while it's being scored.

Avoiding Scorch and Excess Char

Cardboard's paper facing scorches easily, and because it's usually light-colored (kraft brown or white liner), the burn halo around a cut line is much more visible than it would be on darker wood. A few things help:

Low-tack masking tape over the work area before cutting — painter's tape or purpose-made laser transfer tape keeps smoke residue off the visible face and peels away cleanly afterward.
Defocus slightly for engraving/scoring passes — a slightly larger spot spreads energy over more area and reduces the intensity of the char line at the very edge.
Push speed before power when a cut is scorching more than expected. A faster pass at lower power that still cuts through in one or two passes chars less than a slow, high-power single pass.
Strong air assist, aimed right at the kerf, clears combustion byproducts before they redeposit on the surface — see our air assist build guide if you're running without one.

Safety: Cardboard Burns Easier Than You Think

Cardboard and paper products are more flame-prone than wood or acrylic — they ignite at lower temperatures and, once lit, an ember can smolder in the flute channels of corrugated stock long after the head has moved away, invisible until it flares up. Treat this material with real fire discipline:

Never run a cardboard job unattended, even briefly — this is the one material on this site where that rule gets enforced hardest.
Keep a Class ABC fire extinguisher within arm's reach of the machine (see our fire extinguisher selection guide for maker shops).
Run air assist at a setting strong enough to blow combustion products and sparks away from the cut, not just downward onto the material.
After a job finishes, don't assume it's done — check inside any exposed flute channels on corrugated offcuts for smoldering embers before you set scrap aside or throw it in a bin.
Ventilate the room. Burning cardboard and paper releases fine particulate and combustion gases at a similar level to wood smoke; don't rely on a small desktop fan.

Once you've got settings dialed in, cardboard and chipboard earn a permanent spot in the material rotation — not just as scrap for test cuts, but as the fastest way to go from a packaging or prop idea to a physical, foldable, testable object in one laser run. Keep a stack of flattened shipping boxes and a sheet or two of greyboard on hand and you'll find yourself reaching for them more often than you'd expect.

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