What Is a Laser Cutter and How Does It Work?
A laser cutter uses a focused beam of light to cut, engrave, or mark materials. The laser head moves across the material on an X-Y gantry, controlled by software that translates your digital design into motion. The heat of the focused beam either vaporizes, melts, or burns through the material depending on the power level and speed settings you choose.
For makers, laser cutters are transformative tools. They turn a vector file into a precisely cut wooden box, an engraved phone stand, or a custom acrylic sign in minutes — with a level of repeatability that hand tools simply can't match.
The Three Main Types of Laser Cutters
CO2 Lasers
CO2 lasers are the workhorses of the maker world. They use a gas-filled tube to generate infrared light (typically 10,600nm wavelength), which is excellent at cutting organic materials. Most desktop CO2 machines range from 40W to 150W.
Best for: Wood, acrylic, leather, fabric, cardboard, MDF
Limitation: Cannot cut most metals without very high power setups
Diode Lasers
Diode lasers are semiconductor-based and have dropped dramatically in price. Machines like the xTool D1 and various open-frame diode units offer surprisingly capable cutting at a fraction of the cost of CO2 machines.
Best for: Wood, thin plywood, leather, some anodized metals (engraving only)
Limitation: Cannot cut acrylic cleanly; slower than CO2 for thick materials
Fiber Lasers
Fiber lasers produce a shorter wavelength that metals absorb much more efficiently. They are primarily used for metal engraving and marking.
Best for: Metal marking, anodized aluminum, coated metals
Limitation: High cost; overkill for most hobby applications
Key Specs to Understand
| Specification | What It Means | Why It Matters |
|---|---|---|
| Wattage (W) | Power of the laser tube/diode | Higher wattage = faster cutting and ability to cut thicker materials |
| Work Area | Maximum X/Y cutting dimensions | Determines the largest piece you can produce |
| Engraving Speed | Maximum head movement speed (mm/s) | Affects how long large engraving jobs take |
| Focus Type | Manual vs auto-focus | Auto-focus speeds up setup, especially for varying material thicknesses |
| Controller/Software | Built-in controller type | Ruida and LightBurn compatibility are widely considered best-in-class |
Materials: What You Can (and Cannot) Cut
Safe to Cut
- Wood and plywood (under ~12mm for most desktop machines)
- Acrylic/perspex (CO2 only for clean edges)
- Leather and suede
- Paper, card, and chipboard
- Fabric and felt
- Cork and rubber
Never Cut These Materials
- PVC/vinyl — releases chlorine gas, which is toxic and corrosive
- Polycarbonate — burns poorly and produces toxic fumes
- ABS plastic — releases hydrogen cyanide when burned
- Fiberglass — toxic glass particles and resin fumes
Essential Safety Requirements
A laser cutter is not a toy. Before running your first job:
- Ventilation — Route exhaust outside or use a filtered air purifier rated for laser fumes.
- Fire watch — Never leave a laser cutter running unattended.
- Laser safety glasses — Use glasses rated for your specific laser wavelength.
- Fire extinguisher — Keep a CO2 extinguisher within arm's reach.
Getting Started with Software
LightBurn is the industry standard for laser control software and supports the vast majority of desktop machines. It handles both vector cutting paths and raster engraving, and its node-editing tools are powerful enough for complex designs. It's a paid product but offers a trial period. Free alternatives include LaserGRBL (Windows, raster-focused) and the browser-based tools bundled with some machines.
Is a Laser Cutter Worth It?
For makers who regularly produce signage, enclosures, keychains, parts, or decorative items, the answer is almost always yes. The speed and repeatability of a laser cutter changes what you can realistically make in a day. Start with a mid-range diode machine to learn the workflow before committing to a CO2 unit, or access one at a local makerspace first.