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ComMarker · Fiber
ComMarker B4 20W
Compact desktop fiber galvo for bare-metal marking
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Last updated How we evaluate
Released May 2024
TL;DR
The ComMarker B4 is a popular entry-level fiber galvo engraver for jewelry, tools, and metal gifts. Marks stainless, aluminum, and brass without spray. Small marking field: not a cutter for wood or acrylic.
Compare the ComMarker B4 20W to…
Popular side-by-side matchups with full specs, scores, and an honest verdict.
Best for
What makes this machine stand out
Hardware and workflow features worth understanding before you buy : not just wattage on a label.
Fiber metal marking
A fiber source marks bare and stainless steel without spray : the right tool for tools, jewelry, and industrial tags. It will not cut wood or acrylic; pair it with a diode or CO₂ if your shop needs organics too.
LightBurn compatible
LightBurn support means advanced layers, camera tools, and workflows many makers outgrow the stock app with. Confirm your exact controller board before assuming full features : some machines need a paid license separately.
Galvo speed class
Galvo mirrors move the beam instead of a heavy gantry : engraving speeds that feel instant on small fields. Trade-off: tiny work area versus a flatbed diode; ideal for jewelry, tags, and batch marking, not large signs.
Our verdict
Ideal if you
ComMarker B4 20W fits shops that mark stainless, aluminum, and tools daily without a CO₂ bay. A solid bench option for jewelry, tags, and small batches.
Skip if you
Skip if wood, leather, or cast acrylic pay your bills. Deep metal cutting and large industrial panels often need more fiber headroom or a different machine class.
Pros
- Fiber marks metal: does not cut wood or acrylic
- Software listed on the profile: test your workflow (LightBurn or maker app) on scrap first
Cons
- Does not cut wood, leather, or acrylic: metal marking workflows only
- Fume extraction still matters for coated metals and marking sprays
What this machine is for
Affordable fiber marking for metal personalization and small business
Desktop fiber marking for jewelry, tags, tools, and metal personalization.
Laser spot size
~0.02 mm fiber spot
Motion precision: 0.01 mm
Sample engrave job
~2–5 min
10 × 10 cm (4 × 4 in)
Sample cut job
Not a cutter
Reference benchmark: same job size on every machine so you can compare times fairly. Times are estimates for the reference job above; your design complexity and settings will change them.
Materials
- · Stainless steel
- · Aluminum
- · Brass
- · Gold-plated items
- · Some plastics
Accessories & add-ons
Typical inclusions and add-ons for this profile : confirm your SKU.
- Optional
Enclosure / cabinet
Third-party enclosure improves smoke control and safety
- Recommended
Laser safety glasses
~450 nm diode: OD rated for your wavelength
- Recommended
Fire extinguisher
Editorial guidance : not a live parts list. See also: Ventilation setup · Safety basics
Practical notes
Beginner notes
This profile covers ComMarker B4 20W. Read the TL;DR and benchmarks before buying, then compare nearby models on the Compare page.
Pro tips
Use rotary for rings. Dial in hatch and speed on scrap: fiber power is unforgiving on thin metal.
Pro / technical specsRaw numbers for experienced users comparing machines.
- Max speed (spec)
- 7,000 mm/s
- Avg engrave speed
- 500–2,000 mm/s marking
- Avg cut speed
- N/A
Alternatives to the ComMarker B4 20W
Machines in the same space, picked from our database by type, price, and score.
xTool · Hybrid · $3,499 – $3,999
A compact desktop machine combining a 20W fiber laser and 20W diode. The fiber module marks bare metal: stainless steel, aluminum, brass: without spray. Ideal for jewelry, knives, and metal gifts. Premium price for a small work area.
ComMarker · Fiber · $2,499 – $3,499
ComMarker B6 adds MOPA fiber for color effects on stainless and finer control on deep metal engraving. Step up from B4 for shops that need color marking or faster production.
Gweike · Fiber · $1,499 – $2,199
Gweike G2 packages a 20W fiber galvo in a desktop form factor. Solid option if you want metal marking with Gweike ecosystem familiarity from their CO₂ lines.