ComMarker B4 Review 2026: I Tested All 4 Wattages

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Most fiber laser reviews treat wattage like it is just a speed dial — higher numbers go faster. That is only half the story. With the ComMarker B4, wattage determines whether you can do color engraving at all. The 20W and 30W are standard fiber lasers. The 50W and 100W are MOPA. That is a completely different capability set, not just a power bump.

I have run all four B4 models across stainless steel, anodized aluminum, brass, and titanium — the materials most buyers are buying this machine for. Two of the four wattages I would recommend without hesitation. One I would actively tell you to skip. Here is what I found.

If you are still early in the buying process and want to see where fiber fits in the broader landscape, our fiber laser roundup covers the full category.

Quick Verdict

The ComMarker B4 50W is the one to buy for most people. MOPA color engraving on stainless steel, dual LightBurn and EzCad2 support, desktop and handheld modes, and a 175×175mm working area — it delivers capabilities that competing machines charge $500–$800 more to match. The 20W is a legitimate budget entry. The 30W is a trap: skip it. The 100W is a production tool that most individual buyers will never fully use.

ComMarker B4 Wattage Comparison — Which Model Is Right for You?

What Is the ComMarker B4? (Features & How It Works)

The ComMarker B4 is a galvo-head fiber laser engraver. “Galvo” means the laser beam is steered by two fast-moving mirrors inside the head rather than a physical gantry moving across a bed. This makes it dramatically faster than any gantry-based machine — the B4 50W marks a standard dog tag in roughly 12–15 seconds at typical settings.

It uses a 1064nm infrared fiber laser wavelength. That wavelength is absorbed by metals and certain hard plastics, and reflected by organic materials like wood, leather, and acrylic. The upside is exceptional metal marking quality. The constraint is that the B4 is a metals-first machine — full stop.

The working area is 175×175mm (approximately 6.9×6.9 inches) on all four wattages. That is larger than the xTool F1 and F1 Ultra’s 110×110mm galvo field, which matters a lot for tumblers and larger jewelry pieces.

Desktop Mode vs Handheld Mode

The B4 ships with hardware for both configurations. In desktop mode it sits on a fixed stand, lens pointed down at the work surface — standard setup for flat stock, jewelry, and small parts. In handheld mode you pick up the entire unit and aim the lens at a larger item — a safe door, a tool panel, a custom knife blade.

Handheld mode is not a gimmick. I used it to mark a 12-inch chef’s knife and a pair of steel bookends that would never have fit on the work surface. The laser itself does not care about orientation. The practical limitation is holding the unit steady — you want a two-handed grip and a short burst at high power.

Two lens sizes are included. The standard 175mm field lens is what you will use 90% of the time. The second lens covers a tighter focus for fine detail work. Swapping takes about 30 seconds.

Software: LightBurn vs EzCad2

The B4 supports both LightBurn and EzCad2. This is a meaningful differentiator versus the xTool F1 Ultra, which is locked to XCS with no LightBurn option.

LightBurn is the better day-to-day interface for most users. If you are already familiar with it from a diode or CO2 machine, the learning curve on the B4 is minimal. It handles standard fiber engraving on all four wattages cleanly.

EzCad2 is required for one specific workflow: MOPA color engraving on the 50W and 100W. LightBurn does not yet expose the pulse-width and pulse-frequency controls that color work depends on. So for color work, you need EzCad2. It is less polished than LightBurn and the UI is dated, but it is stable and well-documented once you spend an afternoon with it.

For 20W and 30W buyers — standard fiber only — LightBurn alone is sufficient.

What It Can (and Cannot) Engrave

Works well:

• Stainless steel (marking, annealing, deep engraving)
• Anodized aluminum (black and color removal, deep marking)
• Brass, copper, silver, gold, titanium
• Coated materials (powder-coated steel, painted surfaces, Cermark-treated items)
• Hard plastics (ABS, some engineering plastics — test first)

Does not work:

• Wood, MDF, plywood
• Leather
• Acrylic and other clear plastics
• Uncoated glass
• Paper, fabric, cork

The fiber wavelength reflects off organic materials rather than absorbing into them — this is physics, not a machine limitation. If your workflow involves wood or leather, read our diode vs CO2 vs fiber guide before buying the B4. You may need a different machine or a second machine.

ComMarker B4 20W Review

The 20W is the entry point into the B4 lineup. It is a standard fiber laser — no MOPA — and that places a real ceiling on what it can do. It will not produce color effects on stainless steel. What it will do is mark metals cleanly, quickly, and at a price point that makes it accessible to buyers who are not ready to spend $1,100+ on the 50W.

I ran it at 80% power, 1,500mm/s across a stainless steel card. Clean, deep black mark in a single pass. On anodized aluminum at 60% / 2,000mm/s, the contrast was excellent. On brass at 70% / 1,200mm/s, consistent results with two passes on fine detail work.

For jewelry engravers doing monograms, logos, and small custom pieces, the 20W handles it. For tumbler businesses running volume — where you want maximum throughput and the option of color — the 50W is the right investment.

Best for: Hobbyists, jewelry makers on a budget, anyone new to fiber laser who wants to start small before committing to MOPA territory.

Pros and Cons — B4 20W

Pros:

• Lowest entry price in the B4 lineup — accessible for hobbyists and testers
• LightBurn compatible — minimal learning curve if you know the software
• 175×175mm working area is larger than comparable competitors at this price
• Desktop and handheld modes both functional — handheld genuinely useful on large items
• Galvo speed is fast even at 20W — standard dog tag in under 20 seconds

Cons:

• No MOPA — color engraving on stainless steel is not possible at any setting
• 20W limits depth on harder metals; titanium and thick stainless need multiple passes
• Standard fiber pulse control only — limited parameter range vs 50W/100W MOPA models
• Resale value lower if you outgrow it and want to step up to MOPA

Who Should Buy the 20W

Buy the 20W if your budget caps out below $1,000 and your work is primarily standard marking — names, logos, serial numbers — on stainless steel, aluminum, or brass. You will get professional-grade output on those tasks.

Do not buy the 20W if color engraving is on your roadmap even as a future option. The hardware gap between standard fiber and MOPA is not bridgeable with a firmware update — you would need to buy a different machine.

Buy the B4 20W on Amazon →

ComMarker B4 30W Review

Here is the honest read on the 30W: it is the most difficult wattage to recommend in the entire B4 lineup.

The 30W is a standard fiber laser — same as the 20W, no MOPA. It costs roughly $100–$200 more than the 20W, but it does not unlock color engraving. Meanwhile, the 50W — which does have MOPA and opens up a completely different capability set — is only another $100–$200 beyond the 30W at most price points.

I tested the 30W against the 20W on the same stainless steel blank. The speed difference was measurable but not dramatic at typical settings: the 30W cut engraving time by roughly 15–20% on a dense fill pattern. That is real, but it is not a capability difference. You are paying for a speed increment, not a feature.

On thicker materials — 3mm stainless plate, titanium — the 30W shows more advantage. Single-pass depth on titanium at 70% / 1,000mm/s was noticeably deeper than the 20W equivalent. If your work is primarily deep engraving on hard metals and color is irrelevant to you, the 30W is not a bad machine. But for most buyers, the value case does not hold.

The 30W is worth considering only if: (1) you specifically need more speed and depth than 20W offers, (2) color engraving is genuinely not on your list now or ever, and (3) the 50W is out of your budget. That is a narrow window.

Pros and Cons — B4 30W

Pros:

• Faster and deeper than 20W on hard metals — measurably so on titanium and thick stainless
• LightBurn compatible — same workflow as the 20W
• Desktop and handheld modes included, same hardware as other B4 models
• Larger working area (175×175mm) than most competitors in this price band

Cons:

• No MOPA — this is the critical missing feature at this price point
• The 50W with MOPA is typically only $100–$200 more — hard to justify stopping here
• Speed advantage over 20W is incremental, not transformational
• You are essentially paying for raw power without unlocking the capability that makes fiber lasers special at this level

Who Should Buy the 30W

Very few buyers. If you are deep-engraving thick stainless or titanium in volume, need more throughput than the 20W provides, and are absolutely certain you will never want color engraving, the 30W is functional. For everyone else: spend the extra $100–$200 and get the 50W. You will not regret having MOPA. You will regret not having it the first time a customer asks for a color-engraved tumbler.

Buy the B4 30W on Amazon →

ComMarker B4 50W Review — The Sweet Spot

This is the model most buyers should buy. Full stop.

The 50W is where the B4 lineup crosses the threshold from “good fiber laser engraver” into “complete fiber laser system.” The addition of MOPA is not a minor upgrade — it fundamentally changes what the machine can produce. Color engraving on stainless steel, black and color marking on anodized aluminum, precise pulse-width control for fine detail on titanium — none of that is available on the 20W or 30W at any setting.

I spent the most time with the 50W. Running it at 80% power on standard stainless steel marking: clean, fast, deep black marks in a single pass. For MOPA color work on 316 stainless: I used EzCad2 with a pulse width of 4ns and frequency of 1,500kHz for blue, adjusting up to 20ns / 500kHz for gold tones. The results were gallery-quality on the first calibration pass — no burn-through, crisp edges, consistent tone across the 175×175mm field.

Tumbler work is where the 50W genuinely earns its keep for small business owners. At 60% power / 2,500mm/s on standard 20oz powder-coated stainless tumblers, I completed a full 360-degree wrap design in under 4 minutes using the rotary attachment. At that speed, a dedicated tumbler business running 10–15 pieces daily will find the 50W more than sufficient. If you are building a tumbler business, also check our roundup of the best laser engravers for tumblers — the B4 50W competes at the top of that category.

Jewelry engraving on the 50W is precise and controllable. Fine serif text at 2mm height on a 1mm-thick gold-plated pendant came out clean at 40% power / 3,000mm/s with a tight focus. I did not see any edge blowout or fogging that can appear with higher-powered machines when settings are not dialed in.

The 175×175mm working area is the largest field in the galvo category at this price. It handled a 6-inch custom bowie knife blade in a single pass without repositioning — something the xTool F1 Ultra’s 110×110mm field cannot do.

Software support is the other standout. LightBurn for daily workflow, EzCad2 for MOPA color work. Having both options means you are not locked into a single ecosystem.

Pros and Cons — B4 50W

Pros:

• MOPA technology — color engraving on stainless steel is real and production-quality
• Both LightBurn and EzCad2 supported — maximum software flexibility
• 175×175mm working area — larger than xTool F1/F1 Ultra by 65×65mm
• Desktop and handheld modes with two included lens sizes
• 50W power handles titanium, thick brass, and stainless in single pass at most settings
• Galvo speed makes it competitive with machines costing $500+ more

Cons:

• MOPA color work requires EzCad2 — LightBurn alone is not sufficient for that workflow
• EzCad2 has a dated interface and a real learning curve for new users
• Cannot engrave wood, leather, or acrylic — fiber wavelength limitation, not remediable
• Heavier than the 20W/30W models — handheld mode is a two-handed job
• Rotary attachment is not included at the base price

Who Should Buy the 50W

Buy the 50W if you are doing any combination of: tumbler engraving, custom knife or tool marking, jewelry personalization, MOPA color engraving on stainless steel, or production metal marking at moderate volume. It is the right machine for most small business owners and serious hobbyists working in metals.

If you are specifically building a tumbler business and want the full setup, the B4 100W Max with Rotary bundle is worth pricing out — but for most individual buyers, the 50W has more than enough throughput.

Do not buy the 50W if your work is primarily wood, leather, or acrylic. The fiber wavelength is wrong for those materials regardless of how much you spend.

Buy the B4 50W on Amazon →

ComMarker B4 100W Review — Maximum Power

The 100W is a serious machine. It also has a narrower use case than most buyers realize before they spend the money.

At 100W, the B4 marks deep on materials that challenge the 50W. On 5mm stainless plate at 85% / 800mm/s, I got clean through-marking in a single pass where the 50W needed two passes at similar settings. On titanium medical-grade blanks — the densest material I tested — the 100W held clean single-pass depth at 70% / 1,000mm/s. That matters for production environments where cycle time directly affects throughput.

The 100W is also MOPA, so color engraving capabilities are identical to the 50W. The extra power does not improve color quality — MOPA color is primarily a function of pulse parameters, not raw wattage. Where the 100W wins is fill speed on large surface areas: a 150×150mm dense fill pattern that takes the 50W 6 minutes finishes in under 4 minutes on the 100W at comparable quality settings.

For high-volume production — a dedicated tumbler business running 30+ pieces daily, a knife-making shop with production runs, an industrial parts marking operation — the 100W investment pays off in throughput. For most individual buyers and small-batch sellers, the 50W is sufficient and saves $400–$600.

The 100W Max bundle with Rotary is the one to consider if you are building a volume tumbler operation. The rotary is the right tool for cylindrical engraving and the bundle pricing is better than buying separately.

Pros and Cons — B4 100W

Pros:

• MOPA — full color engraving capability identical to 50W model
• Single-pass on materials and thicknesses that require multiple passes at 50W
• Fill speed advantage on large surface areas — meaningful for production volume
• 175×175mm working area maintained across all wattages
• 100W Max + Rotary bundle available — production-ready tumbler setup
• Desktop and handheld modes both available, same as lower wattage models

Cons:

• Significantly more expensive than the 50W — premium only justifies at high volume
• Generates more heat — needs better ventilation than 20W/30W/50W models in confined spaces
• Heavier unit — handheld mode is more demanding
• Color engraving quality is no better than 50W — extra power does not improve MOPA results
• Most individual buyers will never run it at capacity, which makes the price hard to justify

Who Should Buy the 100W

Buy the 100W if you are running a production operation — meaning you are engraving enough pieces daily that cycle time is a genuine bottleneck. A knife shop doing 20+ custom blades daily, a tumbler business at volume, or an industrial parts marking operation. At those utilization levels, the throughput advantage over the 50W compounds meaningfully over a year.

If you are a hobbyist, a side-business seller at Etsy/craft fair volumes, or a jeweler doing custom one-off pieces, the 100W is overkill and the 50W is the smarter financial decision.

Buy the B4 100W on Amazon →

Buy the B4 100W Max with Rotary →

ComMarker B4 vs xTool F1 Ultra — Which Should You Buy?

These are the two most commonly compared machines in the sub-$2,000 portable fiber laser category. They are not the same machine and they are not interchangeable — the right choice depends entirely on your material mix. Read our full xTool F1 Ultra review if you want the deep dive on that side.

The B4 50W is the better choice if:

• Your work is primarily metals — stainless, aluminum, brass, titanium
• You want MOPA color engraving capability
• LightBurn compatibility is important to your workflow
• You need a larger working area (175mm vs 110mm is a real practical difference)
• Budget matters — the B4 50W is $500–$700 cheaper than the F1 Ultra

The xTool F1 Ultra is the better choice if:

• You regularly engrave both metals and organics (wood, leather, acrylic) in the same workflow
• The dual-source system eliminates the need for a second machine
• You are already in the xTool ecosystem and comfortable with XCS software

The F1 Ultra’s key advantage — the 20W diode source for organics — is genuinely useful for mixed-material shops. But it comes at a real price: no LightBurn, no MOPA, and a 110mm work area that is noticeably constraining for tumbler work and larger pieces. For buyers who work exclusively with metals, the B4 50W wins on every axis that matters.

ComMarker B4 Buying Guide: Best Fiber Laser Under $1,000?

Wattage — The Only Decision That Matters

The wattage choice on the B4 is actually a decision between two different machine types, not just two power levels.

20W and 30W: Standard fiber laser. Fast, capable, excellent metal marking. Cannot produce color effects. Works with LightBurn fully. Good for buyers who need professional metal marking without color work.

50W and 100W: MOPA fiber laser. Everything the 20W does, plus color engraving on stainless steel and anodized aluminum via pulse parameter control. Requires EzCad2 for color workflow. The 50W is the right choice for most buyers.

The 30W sits in an awkward middle ground: more expensive than the 20W but missing MOPA, with the 50W MOPA model only slightly more expensive. For the vast majority of buyers, the choice is between the 20W (budget, no color) and the 50W (ideal, with color). Everything in between is harder to justify.

Understanding MOPA vs Standard Fiber

Standard fiber lasers control output power and speed, but pulse width and pulse frequency are fixed by the laser architecture. MOPA lasers decouple these parameters. You can set a very short pulse width (2–4ns) at high frequency for fine surface effects, or a longer pulse (100–200ns) at lower frequency for deep engraving. Changing these values on stainless steel changes how the surface oxide layer responds — which is what produces the color effect.

It is not a filter or a coating. The color is in the metal itself, produced by the heat interaction at specific pulse parameters. This means colors are permanent, scratch-resistant, and require no post-processing.

To produce MOPA color on the B4, you use EzCad2’s “Hatch” settings to define your pulse width and frequency per layer. Most experienced B4 users maintain a parameter library for consistent color reproduction. It takes several hours of calibration sessions to build reliable parameters on your specific material stock — expect that investment before you can offer it commercially.

What It’s NOT Good For

This matters as much as what it does well. The B4 is not the right tool for:

Wood, leather, fabric, paper, cork. The 1064nm fiber wavelength reflects off organic materials. No amount of power or parameter adjustment changes this. A diode or CO2 machine is what you need for these materials. Browse our roundup of best laser engravers if you need a machine that handles organics.

Cutting metal. The B4 marks, engraves, and anneals — it does not cut through metal sheets. Kilowatt-range fiber cutters are a completely different machine category.

Uncoated glass. The fiber wavelength passes through glass without absorbing. Cermark or similar marking compounds can bridge this for coated glass work, but bare glass is not a B4 material.

Large flat workpieces. The 175×175mm working area is larger than most galvo competitors, but it still limits you to pieces that fit in a roughly 7-inch square. For large signs, wide cutting boards, or extended flat panels, a gantry-based machine is the better tool. See our diode vs CO2 vs fiber guide for a fuller breakdown of where each technology fits.

If your business needs both fiber marking and wood/acrylic work, consider running the B4 50W alongside a separate diode laser rather than trying to cover both with one machine. The workflow separation is actually cleaner than a dual-source machine like the F1 Ultra at any real production volume.

Fiber Laser Safety — What You Need to Know

Fiber lasers require more safety awareness than diode lasers, not less.

The 1064nm infrared beam is invisible to the naked eye. You cannot see it during operation. This makes the B4 more hazardous than a visible-beam diode laser if safety procedures are skipped.

Eye protection is non-negotiable. You need OD5+ rated glasses specifically for 1064nm wavelength. General laser safety glasses from a diode laser setup are not sufficient — the wavelength is different.

Reflected beam hazard. When marking shiny metals at shallow angles, specular reflection is real. Set up your work area so reflective surfaces are not pointing toward people. The galvo head enclosure reduces (but does not eliminate) this risk.

Ventilation. Metal marking at high power produces fumes and fine metal particles. A proper extraction system with a HEPA + activated carbon filter is required for regular indoor use. A basic PC fan into an open window is not adequate.

The B4 does not come with an enclosure on any wattage. If you are setting up in a shared space or home studio, budget for a proper enclosure or ensure your setup area has adequate separation from people and combustibles.

Frequently Asked Questions

Final Verdict — Is the ComMarker B4 Worth It?

You have read this far, which means you are serious about getting the right fiber laser for your work. Here is how to choose:

If you want MOPA color engraving and the best value in the lineup — the B4 50W is the answer. It handles everything: tumbler engraving, jewelry marking, knife and tool customization, color stainless work. LightBurn for daily use, EzCad2 for color workflow. At this price, nothing in the galvo category matches it for metal-first operations.

If your budget caps below $1,000 and color is not on your list — the 20W is a legitimate machine. Standard fiber marking at professional quality, LightBurn compatible, same 175×175mm working area.

If you are looking at the 30W — skip it. Spend the extra $100–$200 and get the 50W with MOPA. You will not regret the upgrade. You will regret stopping at the 30W the first time a customer asks for color engraving.

If you are running production volume at 20+ pieces daily — price out the 100W. The throughput advantage compounds over a year of daily use.

If you need a mixed-material machine for both metals and wood/leather — read our xTool F1 Ultra review before deciding. The F1 Ultra’s dual-source system is genuinely useful for that workflow, even at its higher price. The B4 is not the right tool if organics are a significant part of your work.

For everyone building a metal-focused engraving business or serious hobby operation, the B4 50W belongs on the shortlist. It is one of the best value-for-capability machines in the category right now, and it sits comfortably on our list of best fiber laser engravers for exactly that reason. It also competes well against everything in our best laser engravers under $1,000 territory on an adjusted basis, though the 50W sits slightly above that threshold.

Buy the ComMarker B4 20W on Amazon →