Boss Laser LS2440 vs. Fiber Laser: Which Machine Cuts Metal? A Cost Controller’s Guide

So, What Machine Actually Cuts Metal?

If you’ve been shopping for a laser engraver or cutter for any length of time, you’ve probably run into this question. You see a Boss Laser LS2440 demo cutting acrylic beautifully, and then you wonder: can it cut steel? The short answer is no. The longer, more useful answer is: it depends on the metal, the thickness, and how important your time is to you.

I manage procurement for a 40-person custom fabrication shop. Over the past 6 years, I’ve tracked about $180,000 in cumulative spending on laser equipment and consumables. In that time, I’ve watched my boss (and myself) make the same mistake twice: assuming one machine could do it all. So this isn't a 'one-size-fits-all' answer. It's a breakdown by scenario.

Here’s the deal: for metal, you have three main paths—CO2 laser (like the LS2440 or other Boss Laser LS series), fiber laser, and plasma cutting. Oh, and a fourth option some call 'dross plasma cutting,' but that’s more of a technique than a machine. We'll get to that.

Scenario A: You Need to Mark or Engrave Metal (Not Cut Through It)

This is the most common misunderstanding I see. A table top laser engraver—even a capable one like the Boss Laser LS2440—can mark coated metals or create a surface etch on anodized aluminum. But it won't cut through a steel sheet.

What the LS2440 can actually do with metal:

• Engrave coated metals (like powder-coated tumblers or anodized aluminum) by vaporizing the coating, leaving a contrast mark.
• Create light surface etching on brass, copper, or stainless steel with proper marking spray or paste. (The spray acts as a heat-absorbing layer that bonds to the metal surface.)
• Cut thin aluminum up to about 1/16"—but that requires a high-power tube (at least 80W) and it's slow. Like, painfully slow.

The catch: The CO2 laser wavelength (around 10.6 microns) is absorbed by organic materials but reflected by bare metals. So unless you use a coating or marking spray, you're just heating the metal without cutting. I've seen customers return LS2440s expecting it to engrave raw steel. It won't. Honestly, I'm not sure why some sales reps don't emphasize this more clearly. (Should mention: Boss Laser does provide material settings for this in their software, so the engineering is there if you have the right expectations.)

Best tool for this scenario: A fiber laser marker (like Boss Laser's fiber series). Fiber lasers operate at 1.06 microns, which metal absorbs directly—meaning you can engrave serial numbers, barcodes, or logos on steel, stainless, aluminum, and most alloys without spray or paste. In Q2 2024, I compared quotes for a fiber marker versus a CO2 unit for this exact task. The fiber unit was $3,200 more upfront, but it saved us $450 annually in marking spray consumables. Total cost over 3 years: fiber was $1,700 cheaper.

Scenario B: You Need to Cut Thin Metal (Up to 1/8")

If your project involves cutting steel sheet up to about 3mm thick, a fiber laser cutting machine is your best bet. The Boss Laser fiber line can handle this cleanly, with a small kerf and minimal heat-affected zone. The cut edge is smooth enough that secondary grinding is often unnecessary.

But here's where the 'dross plasma cutting' technique comes in. ‘Dross’ is the slag that forms on the bottom edge of a plasma cut. Some plasma cutters leave so much dross that you need to grind it off—which adds time and headache. A good fiber laser, on the other hand, produces practically no dross on thin metal.

• Fiber laser (best for): Clean edges, detailed shapes, under 3mm steel, stainless, aluminum.
• Plasma (best for): Cutting thicker plate (say, 1/4" and up), where edge quality is less critical.

Real talk: If you're cutting 1/8" steel for a sign or frame, a fiber laser is the way to go. I spec'd this out for our shop in 2023. We spent $6,200 on a fiber laser for this purpose. The plasma cutter would have been $2,400—but the cost of dross removal labor and grinding discs would have added $800 in the first year alone. (Prices as of mid-2023 quotes from two distributors; verify current rates.)

Scenario C: You Need to Cut Thick Metal (Over 1/4")

Neither a table top laser engraver nor a standard fiber laser is cost-effective for cutting thick steel plate. At this point, you're looking at a plasma cutter—or a high-wattage fiber laser (3kW or more) that costs as much as a small car.

For shops like mine, plasma cutting is the practical choice. The dross issue I mentioned earlier is real, but manageable:

• Dross plasma cutting (the 'cheap' approach): You use a basic plasma cutter and accept that you'll spend time grinding off the dross. For occasional use, this is fine.
• High-definition plasma: This reduces dross significantly, but the machine cost is closer to $10,000+. For frequent cutting, it pays for itself.

What most people don't realize is that 'dross' isn't just a cleanup issue—it's a cost center. After tracking 18 orders over 2 years in our procurement system, I found that 22% of our 'budget overruns' on metal-cutting projects came from dross-related secondary labor. We implemented a 'cut method pre-approval' policy (plasma vs. fiber vs. waterjet) and cut those overruns by about 60%.

So glad I made that process change. Almost stuck with the old way, which would have meant another year of overruns.

Dodged a bullet when I convinced the team to buy a fiber laser instead of a plasma cutter for our thin-metal work. Was one purchase order away from making a $2,400 splurge that would have raised our labor costs.

How to Choose: A Simple Decision Tree

Here's the practical breakdown—write this down:

1. Marking or engraving metal? → Get a fiber laser marker. The Boss Laser LS2440 won't cut raw steel, and even with marking spray, it's slow for production work.
2. Cutting thin metal (under 1/8")? → Get a fiber laser cutting machine. The edge quality is worth the premium.
3. Cutting thick metal (1/4" +)? → Get a plasma cutter. High-definition plasma if you can afford it; standard plasma with dross cleanup if you're on a budget.
4. Want to cut wood, acrylic, and occasionally thin metal? → Get a CO2 laser like the Boss Laser LS2440 first, and add a fiber laser later. Trying to use a CO2 for metal will frustrate you.

I should add that the Boss Laser LS2440 is a fantastic machine for its intended purpose—engraving wood, cutting acrylic, marking coated metals. But if your primary question is 'what machine cuts metal?' you need to get specific about which metal, how thick, and how clean.

If I remember correctly, Boss Laser offers both CO2 and fiber options. So if you're set on their brand, you can stay in their ecosystem and just pick the right wavelength. That might save you some procurement headaches.

Prices as of early 2025; verify current quotes. The market moves fast—especially on fiber laser units.