The short version: Why I compared the Commarker B4 and B6
If you're shopping for a fiber laser, you've probably landed on two models: the Commarker B4 and the Commarker B6. They look similar, they're from the same brand, but there's a real cost difference. And not just the sticker price.
I'm a procurement manager at a mid-sized manufacturing shop. We do a lot of metal marking—serial numbers, barcodes, logos—for industrial clients. Over the past 5 years, I've tracked every dollar spent on laser equipment, including the hidden costs that eat into budgets. In Q2 2024, we needed to add a new fiber laser to our lineup. So I put both the B4 and B6 through a side-by-side TCO analysis.
Here's what I found. (And no, the answer isn't as simple as "buy the cheaper one.")
Dimension 1: Raw power vs. real-world speed
The spec sheet tells one story. The stopwatch tells another.
The B4 is a 20W fiber laser. The B6 is a 30W fiber laser. On paper, the B6 is 50% more powerful. So it should engrave faster, right?
Yes—but only for certain jobs.
In our tests (10 identical parts each, aluminum, serial numbers):
- B4 (20W): 45 seconds per part
- B6 (30W): 32 seconds per part
The B6 was about 28% faster on that task. Sounds great. But we run a mix of work. When we tested deeper engraving (for steel tooling):
- B4: 4 passes, 3 minutes 10 seconds
- B6: 3 passes, 1 minute 55 seconds
Now the B6 is 39% faster. Not a shock—more power means fewer passes.
My take: If you're marking thin metals or plastics (where marking happens quickly), the speed gap narrows. For deep engraving or steel, the B6 pulls ahead. But faster also means more throughput—which affects your cost-per-part. More on that in a second.
Dimension 2: The sticker price vs. Total Cost of Ownership
Here's where it gets interesting. And a bit painful, honestly.
When I first looked, the B4 was listed around $2,500 and the B6 around $4,200. (Prices vary, always check current listings.) I almost stopped right there. "The B4 is $1,700 cheaper. Done."
But then I ran our TCO model. Over 3 years, accounting for:
- Purchase price
- Shipping
- Installation (we do it ourselves)
- Expected maintenance
- Potential parts (lenses, mirrors)
The gap narrowed. Not to zero—but to about $1,100 over 3 years. Why?
- The B6 came with a higher-quality lens (less likely to need replacement)
- Cooling is more efficient (we work in a hot shop; the B6's fan is beefier)
My cost estimate (based on January 2025 pricing):
- B4 TCO (3 years): ~$2,900
- B6 TCO (3 years): ~$4,000
The B6 is still more expensive. But the gap is smaller than the initial $1,700 suggests. And if you factor in the speed advantage (which means more parts per hour), the B6 could actually pay back faster in high-volume shops.
Dimension 3: The hidden cost (and why the B4 almost won)
Here's the dimension that surprised me—and honestly, makes me reconsider which one I'd buy today.
Software and support.
Both use EzCad2, and the interface is identical. But the B6 model we received came with a slightly better setup guide and a pre-configured profile for 20+ common metals. The B4 had maybe 10 profiles. That small difference cost us time—about 2 hours of tuning on the B4 before we got the first good part.
Two hours in a production shop? That's about $120 in lost labor. Not huge, but annoying. And if you're a new operator, tuning a laser from scratch can take longer.
My takeaway: For a shop with an experienced laser operator, the B4's learning curve is trivial. For a first-time buyer, the B6's extra profiles might save you a day of frustration.
Dimension 4: Power consumption and long-term costs
This one is small but worth noting.
The B6 draws a bit more power (about 60W more at peak). Over a 2000-hour year (that's a lot of engraving), that's about $60-$80 extra in electricity, depending on your local rates. Not a deal-breaker, but it adds to the TCO gap.
So which one should you buy?
Buy the Commarker B4 if:
- You mark mostly thin metals or plastics
- Speed isn't your #1 priority (you can afford 10-30% slower)
- You're on a tight budget and need the lowest upfront cost
- Your operators are experienced with laser tuning
Buy the Commarker B6 if:
- You do deep engraving on steel or hard metals
- Throughput matters—you're running production shifts
- You have the budget for the higher purchase price
- You want the extra profiles (and potentially lower tuning time)
My personal pick (with a grain of salt): We went with the B6 for our high-volume production line. But I kept a B4 on the bench for quick jobs and prototypes. For $2,500, it's a solid workhorse—just not the speed demon.
In the end, neither is a bad choice. It's about matching power to your workload. (And keeping a sharp eye on your own TCO.)
