Longer Nano vs Nano Pro vs Nano Duo AI:
Which Portable Laser Engraver Is Right for You?

Three Generations of Portable Laser Engraving — One Clear Upgrade Path

Longer has built what is arguably the most successful lineup of portable galvo laser engravers on the market. The Nano 6W launched as an affordable, genuinely portable alternative to bulky desktop diode engravers. The Nano Pro 12W doubled the power and pushed engraving speed to 5,000 mm/s with the galvo scanning system. And in 2025, the Nano Duo AI arrived with a generational leap: dual laser sources (20W blue diode + 2W infrared), 10,000 mm/s speed, AI-generated design, auto-positioning, and an expandable 300×300mm workspace.

What makes the Nano series unique is the galvo scanning system — instead of moving the laser head across the material, galvo mirrors redirect the beam at speed. This is why even the entry-level Nano 6W can engrave at thousands of millimeters per second while staying small enough to fit in a bag.

The question isn't whether any of these machines is good — they all are. The question is which one matches your current use case, material needs, and budget. That's exactly what this comparison answers.

More Power = More Materials, More Depth, More Cutting Capability

The Nano 6W is a capable engraver for wood, bamboo, leather, acrylic, anodized aluminum, and coated surfaces. It cannot cut thick wood — it's optimized for engraving detail at speed. The 6W output with the galvo system produces clean, precise marks on flat surfaces and is ideal for personal projects and lightweight production like name tags, coasters, and decorative items.

The Nano Pro 12W doubles the optical power, which unlocks cutting capability up to 10mm of wood in a single pass. It also delivers noticeably deeper engraving on acrylic and leather, and can mark bare metal surfaces with laser marking compounds. For anyone running a small side business or regularly cutting materials rather than just marking them, the 12W is meaningfully more capable than the 6W.

The Nano Duo AI 20W diode laser is the most powerful in the lineup — capable of cutting 16mm of material vertically using the Smart Track Vertical Cut system, and engraving at full 10,000 mm/s. The addition of a 2W infrared (1064nm) laser changes the game entirely: it enables direct engraving on bare stainless steel, anodized aluminum, titanium, brass, and coated metals without any marking spray or consumables. For makers who sell engraved metal items (jewelry, dog tags, keychains, tools), this eliminates the need for a second machine.

Two Lasers, One Machine — Why the Nano Duo AI Changes Everything

Most laser engravers use a single laser source. Diode lasers (450nm blue wavelength) are excellent for wood, leather, acrylic, and coated surfaces — materials that absorb the blue wavelength. But bare metals like stainless steel and aluminum reflect blue laser light rather than absorbing it, which is why diode-only machines cannot engrave them directly.

Infrared lasers (1064nm wavelength) are absorbed efficiently by metals. This is the technology used in professional fiber laser engravers that cost thousands of dollars. The Nano Duo AI integrates a 2W infrared laser alongside the 20W blue diode in the same compact, portable body. You switch between sources via software — no physical swapping, no extra machine.

In practice, this means you can engrave a wood sign and a stainless steel keychain in the same session. For Etsy sellers offering personalized metal jewelry, sports shops engraving trophies, or any maker who works across multiple material types — the Nano Duo AI eliminates the need to own two separate machines. The dual-laser approach is genuinely unique at this form factor and this price point in the portable engraver category.

The Right Nano Depends on What You Make — and What You Plan to Make Next

All three models share the same galvo engraving architecture, compact portable design, WiFi connectivity, and app control. The differences are power, speed, dual-laser capability, AI features, and work area. The best way to choose is to be honest about your use case today — and realistic about where your projects will go in 12 months.

Beginners who just want to try laser engraving on wood, bamboo, and leather will find the Nano 6W more than capable. Makers running a small side business who need cutting capability and higher throughput should step up to the Nano Pro 12W. Anyone who engraves on metal, sells personalized products at volume, or wants AI-assisted design built into their workflow should invest in the Nano Duo AI — it's a different category of machine, not just an upgrade.