Glowforge Aura vs CO2, Diode, and Fiber Lasers: What I Wish I Knew Before Buying a Craft Laser Cutter

If you've spent any time looking at laser cutters, you've probably hit the same wall: too many specs, too many acronyms, too much hype. I'm a custom sign maker by trade—I've been running laser work for orders since 2017, and I've made some genuinely stupid mistakes. The kind that cost money and made me question my career choices.

This article is the FAQ I wish someone had handed me before I bought my first machine. I'm focusing on the Glowforge Aura craft laser cutting machine because it's the one people ask about most at my shop, but I'll also cover how it compares to the bigger CO2 and fiber systems.

Quick table of contents:

• What exactly is the Glowforge Aura?
• Is the Aura a diode laser or a CO2 laser?
• What can the Aura actually cut and engrave?
• Can it engrave metal?
• CO2 vs diode laser—what's the real difference?
• Why does wattage matter more than you think?
• Should a small business buy an Aura or save up for something bigger?

What exactly is the Glowforge Aura?

The Aura is the baby of the Glowforge family. It's a desktop-sized craft laser cutter and engraver designed for small workshops, Etsy sellers, and sign makers who don't have (or can't justify the space for) a full-sized industrial laser.

The Glowforge Aura craft laser cutting machine handles standard hobby materials like wood, acrylic, leather, and glass. It's plug-and-play in a way that bigger machines just aren't. Honestly, the onboarding experience is where Glowforge shines—if you can use a printer, you can figure this thing out.

But "desktop" also means "smaller work area." That's a trade-off you need to think about before you buy.

Is the Aura a diode laser or a CO2 laser?

This is the #1 question I get from people who've read a few spec sheets and now feel more confused than when they started.

The Aura uses a CO2 laser tube, not a diode laser. That might surprise you because the Aura is small and affordable. Most sub-$3,000 machines in this class are diode lasers.

Here's the insider part: the Aura is essentially a miniature CO2 system with software that hides the complexity. The trade-off is that it doesn't have the power of a larger CO2 tube. It's a 40-watt CO2 tube, compared to the 40-50 watts you'd get from a mid-size Glowforge Pro, or the 80-150 watts you'd see in an industrial CO2 system.

But wait—there's a catch. What most people don't realize is that "wattage" in lasers is rarely the full story. A 40-watt CO2 tube can cut differently than a 40-watt diode laser because the beam quality and wavelength are different. That's the next question.

What can the Aura actually cut and engrave?

Here's what I've done with mine (and with customers' Aurse I've trained people on):

• Wood: cuts up to about 1/4" (6mm) in a single pass—depending on wood type—and engraves beautifully on most hardwoods.
• Acrylic: clean edge cuts on cast acrylic up to roughly 1/4". This is a big draw for sign makers.
• Leather: engraves and cuts patterns well, with good depth control.
• Glass: engraves frosted designs, though the surface needs a bit of prep to avoid chipping.
• Anodized aluminum: engraves the coating cleanly if you use the right settings.
• Paper and cardstock: yes, and this is where a lot of invitation makers start.

What it won't do cleanly: thick hardwoods beyond 3/8", most metals in a single pass, and anything with a reflective surface that scatters the beam.

(Thankfully, I only learned this after melting a test piece of PVC—which, by the way, is toxic when cut. Don't. Do. That. Stick to materials the manufacturer lists.)

Can it engrave metal?

Short answer: not bare metal. For bare metal you need a fiber laser or a much more powerful CO2 setup with special assist gas—and even then, you're often painting the surface first.

What the Aura (and other CO2 systems) can do is engrave coated or treated metal. Some paint brands sell metal sheets specifically for laser engraving. I've also seen people use dry moly on metal and then laser it.

The mistake I made early on? Assuming that because a laser could engrave a mineral-coated steel sheet, it could also mark a steel tumbler. It couldn't. That order went sideways fast.

CO2 vs diode laser—what's the real difference?

If you're comparing the Aura to cheaper diode laser engravers, here's the honest breakdown:

• Wavelength: CO2 outputs at 10.6 µm. Diodes typically output around 450 nm (blue) or 808 nm (infrared). CO2 wavelength gets absorbed by organic materials (wood, leather, acrylic) more efficiently, which means cleaner cuts with less charring.
• Material compatibility: CO2 handles clear acrylic beautifully. Diode lasers can't cut clear acrylic well because the beam passes through instead of being absorbed. That's a dealbreaker for many sign shops.
• Maintenance: CO2 tubes have a finite lifespan and need water cooling on bigger systems. Diodes are solid-state and simpler.
• Cost: A 40W CO2 system is usually more expensive than a 40W diode—but compare real cutting capability, not raw laser class.

So, is the Aura "better" than a diode? For cutting and engraving wood, acrylic, and glass? Yes, in my experience, it is. But it's also bigger, more expensive, and not something you'd pack into a tiny apartment setup. Diode lasers have their place.

Why does wattage matter more than you think?

Wattage determines speed and depth per pass. More watts = faster cuts = less edge char = more flexible material choices.

The Aura's 40-watt tube is good, but not spectacular. I worked with an 80-watt CO2 machine (not a Glowforge—a Chinese import, which is a whole other story) and the difference on 1/2" acrylic was night and day. The Aura would take two passes; the 80-watt would slice through in one.

If you're doing production work, this matters. Small projects, craft runs, custom gifts—the Aura is fine. If you're planning to cut 500 pieces of 1/4" acrylic for a client every week, you'd get frustrated fast.

(Note to self: cost of lost production time is a real cost. I didn't account for that when I first upgraded machines.)

What about fiber laser cutting?

Fiber lasers are the metal-cutting workhorses. They use a totally different wavelength (1.06 µm) that metals absorb well. A fiber system can engrave bare steel, aluminum, and even some carbide tooling. They're not ideal for wood and acrylic—the beam is too concentrated and burns organic materials.

So it's not "fiber vs CO2 and one is better." They're different tools. If you're shopping for a large laser engraving machine and want to do both metals and organics, you're usually looking at buying two systems, or choosing one based on what pays more.

My honest take: for most small businesses that do signage, gift personalization, or crafts, a CO2 system (like the Aura or a larger Glowforge model) is the better first purchase. Fiber is a second-machine buy.

Should a small business buy an Aura or save up for something bigger?

This is the question I get from every entrepreneur who finds me through my shop's website.

The Aura is a great starting point if:

• You're doing startup and product testing—not full production.
• You want a low learning curve and don't have a dedicated engineer on staff.
• Your average order is small (1 to 50 pieces, not hundreds).
• You already have an audience (Etsy, a local shop, a niche Instagram account).

You should hold out for a larger machine if you already have orders queued up, you plan to cut thick materials daily, or you need a bigger work area. And if you're a small client with a budget, don't let a salesperson talk you into overbuying. I know the urge—when I was making $200 orders, the vendors who took me seriously back then are the ones I still trust when I place $2,000 orders.

Small doesn't mean unimportant. It means you're just getting started.

One last thing you didn't ask

Laser cutting is slower and more expensive than most beginners expect. The consumables matter: tubes degrade, lenses get dirty, ventilation filters clog. Budget 10 to 15% of your machine cost per year for maintenance and parts.

If you check the Glowforge pricing as of January 2025, the Aura's entry price is below the larger models, but the filter and accessories add up. Verify current pricing at the Glowforge site, though—rates change as new models come out.

Personally, I'd still recommend the Glowforge Aura for the right buyer: the person who wants to start selling laser-cut products without hiring a laser operator. Just go in with your eyes open about what it can and can't do.