Laser Cutting vs CNC Routing: What's the Difference?

Both laser cutters and CNC routers cut shapes from flat material. They're often discussed as if they're interchangeable. They're not — they use fundamentally different mechanisms, have different strengths, and make sense for different types of projects. Here's a plain-language breakdown.

How Each One Works

Laser Cutting

A laser cutter uses a focused beam of light to vaporize or burn material along a programmed path. The laser head moves over the material without touching it. CO2 lasers (like the Glowforge Plus and Pro) are the most common type for hobbyists and small shops; they work well on wood, acrylic, leather, paper, and fabric.

The laser works in 2D — it moves along X and Y axes and can vary power depth, but it doesn't profile-cut in 3D. What it does well: precise flat cutting, clean edges, fine detail engraving on flat surfaces, and cutting thin materials quickly.

CNC Routing

A CNC router uses a spinning cutting bit (a router bit or end mill) that physically removes material by cutting through it. The bit can move in X, Y, and Z — meaning it can cut 3D profiles, deep pockets, and relief carving that a laser can't do.

CNC routing is louder, creates more dust, requires workholding to keep the material in place, and uses consumable bits. But it can cut thicker stock, route true 3D profiles, and work on materials that laser can't (like aluminum or MDF with heavy dust requirements).

CNC software like CarveCo (use code JANKY for 5% off) handles the design-to-toolpath pipeline well for woodworkers.

What Each Is Better For

Where Laser Wins

• Thin flat materials (1/8" to 1/4" wood, acrylic, leather)
• Fine detail work (engraving photos, small text, intricate patterns)
• Projects where edge quality matters (clean, sealed edge on cut acrylic or wood)
• Speed for 2D cutting of flat shapes
• Materials like acrylic and leather where routing would tear or delaminate

The wood switch plates in the shop are laser-cut — 1/8" hardwood veneer, with precise hole spacing for every device type. A router would technically work for this but wouldn't give the edge quality or detail the laser achieves.

Where CNC Wins

• Thick stock (3/4" and up)
• 3D profiles and relief carving (bowls, serving trays, signs with raised lettering)
• Deep pockets and mortises
• Joinery work
• High-volume production with consistent cuts

The serving trays (avocado shape, brass knuckles) use CNC routing for the deep bowl pockets — something a laser can't achieve. CNC template files are available for the avocado tray and brass knuckles tray.

The Combined Workflow

Many makers use both. A common workflow: rough out shapes on the CNC, then use the laser for fine engraving details. Or design files that work on both — the same vector can drive a laser for a prototype and a CNC router for a production run in different materials.

Which Should You Get First?

For most hobbyists and small shop makers: start with a laser. The barrier to entry is lower (no chips, no dust collection requirement, quieter, safer to use indoors), and the range of usable projects is very wide. Add a CNC later if you consistently find yourself wanting to route 3D profiles or cut thicker material.