If you've ever tried to decide between a Glowforge Aura and a CO2 laser marking machine, you know the specs all start to blur. Both use CO2 lasers. Both can handle wood. Both can engrave acrylic. But once you actually have to make something—especially on a deadline—they're very different tools.
To keep things straight: the Aura is a gantry-style CO2 laser cutter. A CO2 laser marking machine is usually a galvo-style engraver. Both use CO2, but they move the beam differently. In my role coordinating production at a custom laser shop, I've watched this comparison trip up more buyers than almost anything else. I've handled 200+ rush orders in the last five years, including same-day turnarounds for event clients. I'm not here to declare a winner. I'm here to help you decide which machine gets your job out the door.
Here's what we're comparing: the Glowforge Aura laser cutter versus a dedicated CO2 laser marking machine. We'll measure them on wattage, cutting capability, software, and the one job everyone asks about—wooden laser cut earrings.
Glowforge Aura Wattage: The 20W Question
Let's start with the spec you searched for. The Glowforge Aura wattage is 20W. Not 40W, not 60W, not a diode source. It's a 20W CO2 laser tube. For a desktop unit, that's a genuinely useful amount of power—if you know what it can and can't do.
A 20W CO2 laser will cut wood up to about 1/4 inch thick, depending on the species and moisture content. It'll cut acrylic, paper, cardstock, leather, cork, and fabric. It'll engrave glass, stone, and coated metal. It won't cut bare metal, and it can't mark bare metal the way a fiber laser can. That's not a flaw; it's the physics of the wavelength.
What can a 20W laser cut, then? Realistically:
- Basswood, balsa, and birch plywood—perfect for wooden laser cut earrings
- Acrylic up to 1/8 inch (and sometimes a bit more, with the right settings)
- Paper, cardstock, leather, felt, cork, and most fabrics
- Not: sheet metal, aluminum, steel, or anything needing deep metal penetration
Now, here's the part that surprises people. A dedicated CO2 laser marking machine with the same 20W rating isn't automatically a better cutter. Most marking machines use a galvo head—the beam scans quickly across a small field. That makes them incredible for marking text and logos, but not ideal for cutting through 3mm wood. The beam movement is fast, but the depth of cut is shallow. You can cut thin material with some of them, but it's like using a marker to do a paintbrush's job.
People assume wattage alone tells you what a laser can do. The reality is that wattage is only one variable. Beam profile, air assist, lens focus, and how the machine actually moves matter just as much. That's why the Aura, with its gantry-style motion and material presets, can outperform a marking machine on a cutting job—even when the wattage number is identical.
Wooden Laser Cut Earrings: The Real-World Test
Let me tell you why this is more than a spec sheet question. In March 2024, a client called at 10 a.m. needing 200 pairs of wooden laser cut earrings for an event 36 hours later. Five-day turnaround in the normal world; this was not the normal world. We had the Glowforge Aura and a CO2 marking machine both available.
I'd be lying if I said it was a hard decision at first. The marking machine was the workhorse—it handles engraving jobs for our repeat clients. But for this job, we needed to cut shapes out of birch sheets, not just burn an engraving into something that already existed.
We tested the marking machine first because it was already set up. It engraved the first sample beautifully. Then we tried to cut a pair of earrings. That's where things got uncomfortable. The beam was fast, but it didn't have the focused dwell time to cut through 3mm birch. We raised the power, lowered the speed, and got charred edges. The Glowforge Aura cut the same shape cleanly in about half the time.
I still kick myself for not testing the Aura earlier. If I had, we'd have saved two hours and a stack of burned scrap. That's the kind of regret that sticks with you.
Does this mean the CO2 laser marking machine is bad? No. It means it was the wrong tool for cutting earrings. For engraving 500 identical tags, it would've smoked the Aura. But for cutting shapes in a sheet, a gantry laser cutter like the Aura is the more reliable choice.
One more note: when you're setting up artwork for wooden laser cut earrings, use files at 300 DPI at final size. That's the same bar commercial print shops use for high-res output. If you're matching brand colors, a Pantone reference helps when you're picking a paint fill or stain—because the laser itself won't reproduce Pantone colors. It only creates the space the color goes into.
Software and Workflow: Where They Split
Under an emergency, software matters more than you'd expect. The Glowforge Aura's software is cloud-based. You drag in a file, choose a material from the library, and the software suggests speed and power settings. That's huge for a rushed operator. You don't spend an hour dialing in parameters. For someone new to lasers, it's the difference between making something and giving up.
But I have mixed feelings about it. On one hand, the Aura's camera alignment and preset library save time every single job. On the other, the cloud dependency is a real risk. When our shop's internet dropped during a rush, the Aura refused to start a job. The CO2 marking machine, running LightBurn, kept going. I've learned to route around it—keep the Aura on jobs that can tolerate a five-minute router reset, and save the 'must-not-fail' jobs for software that lives local to the machine.
A dedicated CO2 laser marking machine typically uses software like LightBurn or RDWorks. It's less friendly. There's no camera preview being spoon-fed to you. You set your own speed, power, and passes. But that complexity gives you control. You can build custom parameter sets, run repeat jobs with absolute consistency, and not worry about a cloud service changing terms out from under you.
Which One Should You Buy?
Here's where I give you the honest limitation speech. There is no universal best. There is only 'best for your particular stack of deadlines.'
Choose the Glowforge Aura if:
- You make small-batch products like wooden laser cut earrings, signs, ornaments, or prototypes.
- You value fast setup and are okay with cloud-based software.
- You want a 20W cut-and-engrave machine without building a dedicated laser workshop.
Choose a CO2 laser marking machine if:
- Your work is mostly high-speed engraving and marking—logos, serial numbers, labels, tags.
- You need to process many identical parts in a fixed position.
- You prefer local, fully configurable software and don't mind a steeper learning curve.
And if you're in a commercial shop that serves different clients, the honest answer might be both. Use the Aura for production runs that need a clean cut edge and the marking machine for high-volume marking. I know that's not a clean one-or-the-other answer, but it's the one that saves your weekend.
Bottom Line: What Can a 20W Laser Cut, Really?
The Glowforge Aura laser cutter is a 20W CO2 machine that cuts wood, acrylic, paper, leather, and fabric—and engraves much more. A CO2 laser marking machine is a specialized tool for marking, not a replacement for a laser cutter. When someone asks 'what can a 20W laser cut?', the answer has less to do with wattage and more to do with the machine built around the tube.
Trust me on this one: choose the tool that matches the job, not the tool that looks more industrial on paper. Your deadlines—and your scrap bin—will thank you.
