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Diode vs CO2 vs Fibre: Which Laser Should You Buy?

Buyer's guide7 min readDIODECO2FIBRE

The type of laser you choose can make or break your workflow, because the wavelength decides what the beam can actually mark. Here's how the three compare — and which one fits a weekend hobbyist, a maker business, or a metal shop.

At a glanceThe key differences

Feature	Diode	CO2	Fibre
Source	Semiconductor diode	Gas (CO2 tube)	Solid-state fibre
Wavelength	~450 nm	10,600 nm	~1064 nm
Best for	Wood, leather, plastics	Wood, acrylic, glass, leather	Metals, industrial plastics
Bare metal?	Marking spray only	Coatings only	Yes — direct
Cutting	Thin wood, card	Medium–thick non-metals	Not for cutting
Precision	High, small area	Moderate, deeper	Extremely high on metal
Maintenance	Low	Moderate (tube, chiller)	Low
Lifespan	10–20k hrs	2–10k hrs (tube)	50–100k hrs
Price (GBP)	£100–£800	£1,000–£6,000+	£2,000–£30,000+
Ease of use	Beginner	Intermediate	Advanced

DiodeBest for beginners and hobbyists

You're a crafter or maker producing custom wood signs, leather goods or small gifts at home.

Budget-friendly and compact enough for a desktop.
Great on plywood, leather, cork, fabric, slate, and anodised aluminium (marking).
Weak on clear acrylic, bare metal and glass.

✓ Real exampleAnna runs a small Etsy shop making personalised keyrings and wooden ornaments. A £300 diode gives her fine detail on small items with almost no upkeep.

CO2Best for makers and small businesses

You're cutting signs, décor or acrylic products and need more speed and power than a diode.

Versatile — cuts thicker material and engraves glass and acrylic, which diodes can't.
Built for batches — faster and more robust for medium production runs.
Trade-offs — size, cost, water cooling, and a tube that needs replacing every few years.

✓ Real exampleBen runs a sign shop. A £3,000 CO2 lets him cut 10 mm acrylic and engrave glass trophies with clean, professional results.

FibreIndustrial-grade metal marking

You need permanent marks on metal — serial numbers, logos, part IDs.

Metal powerhouse — engraves and anneals steel, titanium, brass and aluminium.
Durable — no consumable tube, very long service life.
Trade-offs — expensive, and useless for wood or acrylic.

✓ Real exampleCarla's engineering firm uses a £12,000 fibre to engrave traceable IDs onto titanium components — essential for quality control.

UpkeepMaintenance reality

Diode — clean the lens, keep it cool. Minimal.
CO2 — water chiller, regular lens/mirror cleaning, periodic tube replacement.
Fibre — very little routine maintenance; built for industrial longevity.

VerdictWhich is right for you

Just starting? A diode.
Making products or running a craft business? A CO2.
Marking metal for production? Only a fibre.

⚠ Before you commitWhatever you choose, the material decides the outcome as much as the machine. Check the materials guides for what each wavelength does per material, and run a test grid on day one.

FAQCommon questions

Can any of them do everything?

No. A diode or CO2 handles most hobby and craft work; a fibre is a specialist metal tool. Many pros end up with a CO2 and a fibre rather than one machine that compromises on both.

Can a diode mark metal at all?

Only bare metal with a marking compound (e.g. a Cermark-type spray), or anodised/coated metal directly. It won't engrave into raw steel.

⤴ Next step

Narrowed it down? Read the full buying guide for power, bed size and budget, then see the hardware we test with.

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