The package arrived on a Tuesday. Inside were 24 clear glass ball ornaments—each about 3 inches wide, wrapped in tissue paper. A customer had ordered them for a family reunion in mid-December, with names and small Christmas trees engraved into the glass.
By Friday, I'd destroyed 12 of them. Cracked, shattered, or—as one memorable piece did—popping loudly in the middle of my workshop. (Thankfully, I was wearing safety glasses.)
Total damage: roughly $320 in material and an uncomfortable phone call to a paying customer. The worst part? The answer was right in front of me the entire time. I simply hadn't looked.
Why I Chose the Commarker Omni 1
I started my laser engraving side business in early 2023 with a 20W diode laser. It worked—kind of. Slow, limited, and constantly leaving me wishing for more power. When requests for metal tumblers and glassware started coming in, I knew I needed a serious upgrade.
Most people in my situation go straight to a standalone CO2 laser. I went a different route: the Commarker Omni 1. It's a hybrid machine with two laser sources in one enclosure—a CO2 tube for organic materials and a pulsed fiber source for metals. Commarker markets it as an engraving, cutting, and cleaning machine for small shops, and the versatility was the draw for me. I didn't have space for two machines.
I spent about 25 hours researching before ordering. Forums, tear-down videos, Facebook groups—all of it. The consensus was that the Omni 1 was a solid middle ground: not the cheapest, not the most specialized, but genuinely useful for a one-person operation switching between materials.
The unit arrived in September 2023. Setup took a day. For the first month, I was impressed. The fiber source handled stainless steel tumblers effortlessly. The CO2 source produced clean results on walnut and birch. I felt like I'd made exactly the right call.
Then came the glass order.
How I Ruined 12 Ornaments in One Afternoon
Here's the sequence of events that led to my $320 lesson:
I designed the ornament layout in LightBurn. Names in a script font, a small Christmas tree, sized to fit a 3-inch sphere without wrapping awkwardly around the curve. I sent the customer a proof; she approved it.
Then I set up the job on the fiber source.
That was mistake number one.
Most buyers focus on wattage when choosing a laser and completely miss the wavelength and its interaction with the material they're engraving.
The Omni 1's fiber source operates at 1064 nanometers—a wavelength metals absorb beautifully, but glass basically lets pass through. The small amount that is absorbed creates localized heat stress. On thin glass, that stress turns into micro-cracks. And micro-cracks, given enough energy, propagate into full cracks.
The first ornament cracked about a second after the beam hit it. A sharp ticking sound, and suddenly a hairline fracture spanned the glass. I stopped, assumed I'd mis-focused, and tried again. Same result. I lowered the power and tried a third time. Crack. Fourth ornament? Crack. Fifth? Crack. (Ugh.)
Each time, I told myself the same thing: "it'll work if I adjust this." It didn't. And here's the kicker—I had the right laser for glass in the same machine. I just never switched sources.
People think more power means faster engraving. On glass, the opposite is true. More power means more rapid localized heating, which means more thermal shock, which means more cracking. The assumption is that a powerful laser handles tough materials better. The reality is that wavelength determines what gets absorbed in the first place.
After the fifth failure, I called the customer. That call was harder than I expected. She said, "Tell me when you can deliver." No drama, no cancellation. I told her I'd figure it out and get back to her by the end of the day. That deadline pushed me to actually research instead of guessing.
The Fix That Finally Worked
The answer, once I found it, was embarrassingly simple: I was using the wrong source. Glass absorbs 10.6μm light—the CO2 wavelength, the one the Omni 1's dedicated CO2 source emits—far better than 1064nm fiber light. The CO2 source was the right tool for this job all along.
To be fair, the fiber source is excellent on metals. The problem wasn't the Omni 1. It was my assumption that the more powerful source would do a better job regardless of material.
There was one more twist. Even with CO2, direct engraving on thin glass causes thermal shock. The technique that kept coming up in forums was the wet paper towel method. It sounds like a hack, but it works: the damp paper creates thermal contact and acts as a heat sink, absorbing enough energy to prevent crack-inducing stress while the glass surface still gets etched.
The question everyone asks when comparing laser machines is: "how many watts?" The question they should ask is: "what wavelength does it emit, and how does that interact with the materials I'm using?" Wattage determines how fast heat builds up. Wavelength determines whether the material absorbs that heat in the first place.
The upside of trying the wet paper method was obvious: 12 ornaments left and a technique backed by multiple user reports. The risk: it might not work for me, and I'd lose more material. Calculated the worst case—another $80 in ornaments and a completely blown deadline. Best case: the order was saved and I learned a transferable skill. The expected value said try it.
Here's the method that finally produced clean results on my machine:
- Clean the glass with isopropyl alcohol and let it dry completely.
- Wrap each ornament in a single layer of damp paper towel. Not soaking wet—if water pooled, the laser would skip. Just damp.
- Switch the Omni 1 to its CO2 source.
- Set power to around 12% and speed to roughly 800 mm/s. Don't hold me to those exact numbers—they vary by machine—but they're a fair starting point for 3-inch glass ornaments.
- Run the engraving. The paper burns slightly in the engraved areas; the glass beneath comes out frosted and clean.
- Rinse, dry, and inspect under bright light for micro-cracks.
The first ornament came out clean. The second too. I engraved all 18 remaining ornaments in one sitting without a single crack.
The customer received her ornaments on time and sent me a photo of them on her family's tree. I felt relief more than pride. But that relief gave me a new rule: test on scrap before touching a customer's material.
Christmas Laser Cut Ideas That Paid Off
That ornament job turned into something bigger. Christmas is the biggest season for laser shops, and after my glass education I leaned into it. Between November and December, I filled my spare hours with laser-cut products for local markets. Here's what actually sold:
Custom ornaments. Wood, acrylic, and glass. Acrylic blanks had the best margin—cheaper than wood and faster to engrave.
Gift tag sets. Birch plywood cut into tags, engraved with names, bundled in sets of 20. Material cost was roughly $0.30 per tag; I sold the sets at $12.
Snowflake coasters. Birch rounds, 4 inches wide, with engraved snowflake patterns. One of the easiest batch items I've made.
Personalized cheeseboards. Bamboo and walnut boards with family names. Higher-ticket, and it attracted customers looking for substantial gifts.
Farmhouse-style Christmas signs. 12-inch square boards with "Merry Christmas" and a last name. My best seller at the holiday market.
One idea flopped: acrylic snow globes. I spent an afternoon prototyping and never got a clean liquid seal. (Note to self: don't test new products the week before a market.) I dropped it. Not every idea wins.
The revenue share surprised me: Christmas-specific projects contributed around 60% of my November and December income. For a side business that started as an experiment, that was the proof I needed that seasonal product planning matters.
Can One Machine Do It All? Omni 1 vs. B6 60W vs. 1kW Fiber
After the holidays, I had the classic "should I upgrade?" conversation with myself. A lot of people ask whether the Omni 1 Commarker should have been a standalone CO2 unit instead.
The Commarker B6 60W is Commarker's dedicated CO2 machine. It has a real CO2 tube, a generous work area, and a competitive price if you don't need fiber. If your focus is wood, acrylic, and glass, the B6 60W is a solid choice and arguably gives you more machine for the same budget.
But would the B6 have prevented my glass disaster? No. My mistake wasn't equipment; it was process. The Omni 1 already had the right tool inside it. I grabbed the wrong source because I hadn't educated myself.
The 1kW fiber laser is a completely different conversation. I get asked about it by people who think more power solves everything. A 1kW fiber laser is an industrial-grade metal marking system. For a shop making ornaments, gift tags, and the occasional tumbler, it's overkill by a significant margin. The Omni 1's fiber source already handles the metal jobs I actually get. The bottleneck is rarely the machine; it's workflow and knowledge.
I kept the Omni 1. No regrets.
My 12-Point Pre-Flight Checklist
Here's the practical output of that $320 mistake. We didn't have a formal test-first process before—this is what I built after. Before every job now, new material or repeat order, I walk through this:
- What is this material, and what coating or finish does it have?
- Which wavelength does this material absorb best?
- Am I on the correct source (CO2 vs. fiber)?
- Do I have a scrap sample of the same material to test on?
- What do my saved settings say about this material and machine combo?
- Is the focal distance correct for the material height?
- Is the lens clean? Is air assist working?
- Is my design at 300 DPI or higher? (Same standard as commercial print—don't accept lower-resolution source files.)
- Does the design concentrate heat in one spot too aggressively?
- Did I test at the planned speed and power on scrap?
- What's a realistic completion time for this order?
- Did the customer approve the proof?
The checklist isn't glamorous. It doesn't require talent. But it works when you're tired, rushed, or overconfident. Five minutes of verification beats five days of correction. I say that from experience—the expensive kind.
The Lesson
If you're looking at a laser etching machine for glass—or any material, honestly—start with the material, not the machine. Learn what wavelength it absorbs, what defects look like, and how to test safely. Then let that knowledge guide your tool choice.
Fiber vs. CO2, 1064nm vs. 10.6μm, thermal shock, wet wrapping—these details sound technical right up until you watch twelve ornaments crack in a row. Then they become the difference between a happy customer and a very apologetic email.
I still make mistakes. But now I make them on test scraps, not on customer orders. And that's the whole point.
Five minutes of testing. That's the whole post.
