Laser Engraver Stencil Cutting: CO2 vs Diode vs Fiber

Laser cutters work by focusing a laser beam onto material to vaporize, melt, or cut it. The wavelength of the laser determines which materials it interacts with effectively.

CO2 LASERS (10,600 nm wavelength) are the standard for cutting and engraving organic materials. Wood, paper, cardstock, leather, fabric, acrylic, mylar (with caution), rubber stamps, and many plastics cut cleanly with CO2. CO2 lasers do NOT cut metal effectively (they reflect or barely mark it). Power ranges: 40W to 150W+ for home/small-studio machines; industrial machines can be 500W+.

DIODE LASERS (typically 445 nm blue wavelength, sometimes 808 nm IR) are the newer hobbyist category. They cut paper, thin wood, leather, dark plastics, and engrave on light wood, cardboard, and similar. They do NOT cut thicker materials as cleanly as CO2 (lower effective power) and do NOT engrave clear or light materials well (the blue wavelength reflects off light surfaces). Power ranges: 5W to 40W+ for hobbyist machines.

FIBER LASERS (1,064 nm IR wavelength) are the industrial standard for marking and cutting METAL. They engrave stainless steel, aluminum, brass, and other metals. They do NOT cut wood, paper, or most organic materials effectively (the wavelength passes through or doesn't interact). Power ranges: 20W to 100W+ for typical industrial setups; mark/engrave on metal is fast, cutting thicker metals slow.

FOR STENCIL CUTTING, the relevant technology is almost always CO2 (for organic/plastic stencil materials) or DIODE (for hobbyist budget). FIBER lasers are not used for typical stencil cutting because metal stencils are uncommon outside industrial applications.

Material compatibility is the most-important factor in laser choice for stencils.

CO2 LASER cuts (40W+ machine, common settings): - Paper, cardstock: easy, fast, clean - Acrylic (cast acrylic, not extruded): smooth polished edges - Wood (plywood, basswood up to 3mm): clean cuts, faint burn marks - Leather: clean cuts with smell - Mylar (with caution): polyester mylar melts and produces toxic fumes when cut with CO2 — ONLY cut polyester mylar with adequate ventilation and an air assist; better to use a different stencil material - HDPE plastic (high-density polyethylene): cleaner alternative to mylar, lasers well - Cardboard: easy - Cardstock for one-shot stencils: perfect

CO2 LASER does NOT cut: - Metal - PVC (releases TOXIC chlorine gas — NEVER cut PVC with any laser) - Polycarbonate (Lexan) — melts and produces fumes; not a good cutter material - Very thick wood (>10mm typically struggles even on higher-power CO2)

DIODE LASER cuts (10-20W typical hobbyist): - Paper, cardstock: yes, slower than CO2 - Thin wood (1-3mm basswood): yes with multiple passes - Dark acrylic: yes (clear/white acrylic reflects blue laser) - Thin HDPE: yes with practice - Leather (dark): yes

DIODE LASER does NOT cut: - Light-colored acrylic, glass, or clear materials (blue wavelength reflects) - Metal - Thick materials beyond ~5mm typically - PVC (toxic, never cut)

FIBER LASER for stencil work is generally not relevant unless cutting metal stencils for industrial use.

THE RECOMMENDATION for typical stencil work: CO2 laser if budget allows (used 40W can be found ~$1,500-$3,000); diode laser as hobbyist alternative ($500-$1,500 range); avoid PVC and toxic materials regardless of laser type.

Laser settings vary by machine, material, and material thickness. Key settings:

POWER: how much energy the laser delivers. Higher power = faster or deeper cuts. Common range: 20-90% of machine maximum for cutting; 5-30% for engraving.

SPEED: how fast the laser moves across the material. Slower = more energy delivered to a given spot = deeper cut. Common range: 5-30 mm/s for cutting; 50-200 mm/s for engraving.

FREQUENCY (CO2 lasers, PWM): pulse rate of the laser. Higher frequency = smoother cut on acrylic; lower frequency = more efficient on wood and paper.

AIR ASSIST: airflow blown across the laser cut point. Removes smoke and reduces flame-up. Essential for clean cuts on wood and paper; mandatory on any plastic to prevent fume buildup.

PASSES: number of times the laser moves across the cut path. For thick materials, multiple passes at moderate power produce cleaner results than single pass at high power.

EXAMPLE SETTINGS (60W CO2, generic): - 3mm basswood: 20-30 mm/s, 70-80% power, 1-2 passes - 5mm acrylic: 5-8 mm/s, 80-90% power, 1 pass (with air assist) - 100lb cardstock: 30-50 mm/s, 30-40% power, 1 pass - 3mm HDPE: 15-20 mm/s, 60-70% power, 1-2 passes - Mylar 5 mil (with caution): 30-50 mm/s, 20-30% power, 1 pass, full ventilation

EXAMPLE SETTINGS (15W diode, generic): - 1mm basswood: 5-10 mm/s, 80-100% power, 1-2 passes - Cardstock: 20-30 mm/s, 50-60% power, 1 pass - Dark acrylic 3mm: 5 mm/s, 100% power, 3-5 passes (slow but possible)

ALWAYS RUN TEST CUTS on small scrap pieces before production. Settings vary by material lot, machine wear, and ambient conditions.

Laser cutting produces fumes, smoke, and (with the wrong material) toxic gas. Safety is non-negotiable.

VENTILATION: - Active exhaust fan vented outside is standard - Inline blower (booster fan) recommended for runs longer than a few minutes - Carbon filter inside the exhaust path for additional fume removal (acrylic, plastics) - NEVER cut inside a sealed room without active ventilation

MATERIAL SAFETY (the critical list of don'ts): - PVC (vinyl, "vinyl record" plastic): NEVER cut — releases hydrochloric acid gas - ABS plastic: avoid — releases cyanide - Polycarbonate (Lexan): avoid — melts, fumes, not a clean cutter material - Fiberglass: avoid — releases hazardous particles - Foam-board with PVC layers: NEVER cut

MATERIALS that produce nuisance smoke but are OK with ventilation: - Wood (always — clean smoke, smell) - Paper, cardstock (clean smoke) - Mylar (more aggressive smoke, manage with ventilation and short runs) - HDPE (manageable with air assist + ventilation) - Leather (smelly but not toxic in moderation) - Acrylic (cast acrylic produces cleaner cuts; ventilation handles fumes)

FIRE SAFETY: - ALWAYS supervise the laser during operation - Keep CO2 fire extinguisher or class B/C extinguisher nearby - Have a fire blanket at hand - Air assist reduces flame-up risk substantially - Don't leave any thick or unfamiliar material running unattended

PERSONAL SAFETY: - Laser glasses rated for the specific laser wavelength - Don't look at the cutting point even with a closed lid (CO2 lasers leak some IR) - Diode laser glasses for diode machines (different wavelength than CO2) - No bare skin in the cutting area when operating

Both technologies cut stencils. Choose based on:

CHOOSE LASER for: - Thick materials (mylar 5+ mil, acrylic, wood) where vinyl cutters struggle - Production volume — lasers cut much faster than vinyl cutters - Precision details (laser kerf is finer than blade kerf) - Multi-material projects where the same machine cuts wood, acrylic, paper, fabric - Workflows where engraving (not just cutting) matters

CHOOSE VINYL CUTTER for: - Adhesive-backed materials (vinyl, freezer paper) where laser would burn the adhesive - Heat-sensitive materials (HTV, dye-sub paper) where laser heat damages the material - Fabric (lasers char fabric edges; vinyl cutters with fabric blade make clean cuts) - Budget-constrained workflows ($200-$500 for a Cricut vs $1,500+ for a laser) - Detailed-but-thin paper stencils where vinyl-cutter precision is plenty

THE PRODUCTION SHOP that does diverse stencil work typically owns both — vinyl cutter for adhesive materials and fabric; laser for mylar, wood, acrylic, and production runs.

PRICE COMPARISON (approximate 2026 retail): - Cricut Maker 3: $400 - Silhouette Cameo Pro: $600 - xTool D1 Pro diode laser (10-40W): $400-$1,200 - xTool P2 55W CO2 laser: $4,000 - OMTech 60W CO2 laser: $2,500-$4,000 - Glowforge Pro: $7,000

LEARNING CURVE: laser is significantly steeper than vinyl cutter. Settings matter more, safety matters more, material handling matters more. Plan for 20-50 hours of practice and test cuts before producing high-quality work.

StencilIQ outputs SVG files with cut paths properly defined for laser cutting. The SVG includes single-line cut paths (no double-cuts that would produce double burns or fire risk), bridges placed for the material thickness you specify, and proper layering for different cut operations (engrave vs cut vs score) if needed. Import the SVG into your laser software (LightBurn, xTool Creative Space, Glowforge App) and the design is ready to cut. For multi-material projects, StencilIQ can output separate layers for different cut depths or laser power settings.