Atomstack Proxima Fiber vs ComMarker B4 20W
| Laser | ||
| Type | Fiber Laser | Fiber Laser |
| Wavelength | 1,064 nm | 1,064 nm |
| Optical Power | 20 W | 20 W |
| Performance | ||
| Work Area | 200 × 200 mm | 150 × 150 mm |
| Max Speed | 300,000 mm/min | 600,000 mm/min |
| Focus | Fixed | Manual |
| Features | ||
| Enclosure | Yes | No |
| Air Assist | No | No |
| Rotary Compatible | No | Yes |
| WiFi | No | No |
| Camera | No | No |
| Physical | ||
| Approx. Price | $1,799 | $1,399 |
| Release Year | 2023 | 2022 |
| Weight | 12 kg | 11 kg |
Pros & Cons
Atomstack Proxima Fiber
What we like
- 20W MOPA fiber for deep, precise metal marking
- Very fast galvo scanning head
- Enclosed for eye safety
- Competitive price for a fiber laser
- Excellent for jewelry and industrial marking
Watch out for
- Cannot process wood or acrylic
- Small 200×200mm work area
- No rotary support
- Steep learning curve for new users
ComMarker B4 20W
What we like
- Compact and portable at only 11 kg
- Affordable entry into professional fiber laser engraving
- Available in 20W/30W/50W/100W variants
- Works with EzCad2 and LightBurn
- Strong community and accessory ecosystem
Watch out for
- No autofocus (manual or separate motorized lift table)
- Standard 110×110mm work area is small (optional lens required for 200×200mm)
- USB-only connectivity (no Wi-Fi)
- No built-in enclosure or camera
Compatible Materials
Atomstack Proxima Fiber
Metal EngravingAnodized AluminumGlassStoneRubber
ComMarker B4 20W
steelaluminumbrasscopperAnodized AluminumtitaniumgoldsilverLeathercoated metals
The ComMarker B4 20W costs $1,399 (22% less) than the Atomstack Proxima Fiber, which is priced at $1,799.
Both machines share the same 20W optical power rating.
The Atomstack Proxima Fiber offers a 44% larger work area (200 × 200 mm vs 150 × 150 mm).
The ComMarker B4 20W has a 50% higher maximum speed (600,000 mm/min vs 300,000 mm/min).
Feature-wise, Atomstack Proxima Fiber includes an enclosure, while ComMarker B4 20W does not; ComMarker B4 20W includes rotary attachment compatibility, while Atomstack Proxima Fiber does not.