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ComMarker · Fiber
ComMarker B4 20W
Compact desktop fiber galvo for bare-metal marking
Last updated How we evaluate
Released May 2024
What this machine is for
Affordable fiber marking for metal personalization and small business
Reference benchmark same job size on every machine so you can compare times fairly.
Laser spot size
~0.02 mm fiber spot
Smaller spot = finer detail (frame motion is usually the same across tiers)
Motion precision: 0.01 mm
Sample engrave job
~2–5 min
Filled logo on stainless steel plate
10 × 10 cm (4 × 4 in)
Sample cut job
Not a cutter
Times are estimates for the reference job above; your design complexity and settings will change them.
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.
What this machine is for
Desktop fiber marking for jewelry, tags, tools, and metal personalization.
Best for
Materials
Engraves
- · Stainless steel
- · Aluminum
- · Brass
- · Gold-plated items
- · Some plastics
Cuts
- · Limited cutting ability
Cannot do
- · Wood production
- · Clear acrylic
- · Large signage panels
- · Thick organic cutting
Pros
- ✓Strong value in desktop fiber segment
- ✓Direct metal marking without chemicals
- ✓LightBurn compatible on many units
- ✓Compact footprint for desk jewelry work
Cons
- ✗Small marking area vs open-frame diodes
- ✗Not for wood/acrylic shop work
- ✗Requires safety glasses and ventilation discipline
- ✗Rotary and fixtures often cost extra
Beginner notes
Buy if metal is your main income stream. Skip as a first laser if you want large wood signs or acrylic cutting.
Pro tips
Use rotary for rings. Dial in hatch and speed on scrap — fiber power is unforgiving on thin metal.
Pro / technical specs
Raw numbers for experienced users comparing machines.
- Laser spot size
- ~0.02 mm fiber spot
- Max speed (spec)
- 7,000 mm/s
- Avg engrave speed
- 500–2,000 mm/s marking
- Avg cut speed
- N/A
- Motion precision
- 0.01 mm