Wood Signs vs Metal Engraving: What xTool F1 Ultra Can (and Can't) Do

Two Lasers, One Box: The Real Trade-Offs

When I ordered the xTool F1 Ultra for our workshop back in October 2024, I wasn't entirely sure what I was getting into. Honestly, the pitch sounded too good: a 20W fiber laser AND a 20W diode laser in one desktop unit. You can engrave metal and cut wood? Sign me up.

But after six months of running it daily, I've learned something important: dual lasers don't mean double the capability. They mean two specialized tools that share a housing. And if you're deciding between a dedicated wood sign machine and a fiber laser for metal, understanding their differences is everything.

Here's the breakdown—no fluff, just what I've seen work (and fail) in actual small-batch production.

What Is Laser Cutting, Anyway?

Let's start with the basics, because I made the mistake of assuming I knew. Laser cutting uses a focused beam to vaporize material along a path. Simple, right?

Well, here's the catch: not all lasers cut the same materials. A CO₂ laser cuts wood and acrylic beautifully but struggles with metal. A fiber laser cuts metal but won't touch clear acrylic. And diode lasers? They're somewhere in between—great for thin wood and leather, but don't expect to cut 10mm plywood in one pass.

According to the xTool documentation (which I read after my first failed attempt at cutting 3mm steel with the diode), fiber lasers operate at 1064nm wavelength, while diode lasers are typically around 445-455nm. That difference determines what each can handle.

"A 20W fiber laser will engrave stainless steel, aluminum, and even coated metals cleanly. A 20W diode laser is better for wood, leather, and acrylic—but don't expect it to mark metal."

If I remember correctly, the F1 Ultra's diode is rated at 20W optical power, which is decent for its class. But comparing it to a dedicated 40W CO₂ laser for wood cutting? That's a different game entirely.

Wood Sign Engraving: Where the Diode Shines

Our first major project was a batch of 50 wooden welcome signs for a local hotel chain. I used the diode laser on the F1 Ultra, and honestly? It handled walnut and oak beautifully. The detail on text was sharp—crisp edges, no charring on the lighter woods.

But here's what surprised me: air assist is non-negotiable for wood. The xTool F1 Ultra has a built-in air assist nozzle, but I didn't realize how much it mattered until I ran a test without it. The burn marks were ugly. With air assist? Clean cuts, minimal cleanup.

In our 2024 production run, we processed about 200 signs using the diode laser. Setup time was short—maybe 10 minutes per job—and the results were consistent. But if you're cutting thick wood (over 6mm), you'll need multiple passes. That's the trade-off for a desktop unit.

Fiber Laser for Metal: The Real Game-Changer

Now, the fiber laser is where the F1 Ultra earns its keep. I've engraved stainless steel tumblers, aluminum nameplates, and even a few titanium keychains. The detail is stunning—micro-text that would blur on a diode laser comes out sharp on fiber.

Here's a comparison from my experience:

• Diode on metal: Barely visible mark, fades with handling. Not useful for serial numbers or durable branding.
• Fiber on metal: Deep, permanent engraving. Survives washing, abrasion, and UV exposure.

In Q1 2025, we switched our metal signage production entirely to the fiber laser. The diode handles the wood signs; the fiber handles the metal tags. It's a clean split, and it saves us from buying two separate machines.

But—and this is important—don't expect the fiber laser to cut metal. It engraves beautifully, but cutting even 1mm steel requires a higher-power fiber source (usually 30W+). The F1 Ultra's 20W fiber is optimized for marking and shallow engraving.

Which One Should You Choose?

If you're on the fence, here's my honest take based on our workshop's experience:

Choose the xTool F1 Ultra if:

• You need both wood sign engraving AND metal marking in one machine
• You have limited desk space (it's compact—about the size of a large printer)
• You're okay with slower wood cutting (multiple passes on thick material)
• You value versatility over raw power in any single material

Consider a dedicated machine if:

• You primarily cut thick wood (over 6mm) and need speed
• You need deep metal cutting (not just engraving)
• Your budget allows separate units for fiber and CO₂ applications

One last thing: the F1 Ultra's rotary attachment is excellent for cylindrical items like glasses and tumblers. But that's a topic for another article.

"Pricing for the xTool F1 Ultra was around $1,999 as of Q4 2024. Verify current rates before purchasing—the market changes fast."

In hindsight, I should have researched the fiber vs diode capabilities more thoroughly before buying. At the time, I assumed '20W dual laser' meant double the power. What it actually means is two specialized tools that cover more material types—but each with its own limits. That's not a flaw; it's just reality.