Let me start with a confession. When a client asks about metal engraving, my first instinct isn't to reach for the xTool S1 40W. It's to ask: What kind of metal? And how much time do you have?
In my role coordinating custom engraving for small-to-medium businesses, I've processed over 200 rush orders in the last three years. I've had to choose between a diode laser like the xTool S1, a mid-range CO₂, and a fiber laser—sometimes within hours of a deadline. Here's my take on how these options stack up, specifically for metal work, and why the 'best' choice depends on more than just wattage.
What We're Comparing: The Core Framework
This comparison isn't about which laser is 'better' in a vacuum. It's about which tool solves the problem for you given your budget, your timeline, and your typical material list. We're looking at three main contenders for metal engraving:
- Option A: The xTool S1 40W (diode laser with 1064nm module). This is a modular system, meaning you can swap modules to handle different materials.
- Option B: A dedicated fiber laser (often touted as the '100W fiber laser' solution). This is a single-purpose machine, typically in the $3,000–$10,000 range.
- Option C: The 'old standby': Chemical etching or rotary engraving—the non-laser alternatives for metal.
Note: My experience is based on about 200 mid-range orders (from $50 to $2,000). If you're a production shop doing high-volume metal parts 24/7, your calculus might be different. I can't speak to industrial-scale setups.
Dimension 1: Upfront Cost vs. Hidden Costs
This is where the value-over-price debate gets real. Look, the xTool S1 with the 40W module costs roughly $1,200–$1,800 (as of January 2025). A fiber laser? You're looking at $3,500–$9,000 for a decent entry-level machine. On paper, the xTool is the clear winner. But here's the thing: that's just the sticker price.
The xTool S1 scenario: You buy the 40W module. It can mark bare metals (like aluminum and stainless steel) with a special marking spray, but it won't cut any metal thicker than a razor blade. If your client wants a deep engrave—something you can feel with your fingernail—you're looking at multiple passes, which takes time.
The fiber laser scenario: The machine costs more. But it engraves metal directly—no spray, no pre-treatment. It can mark, anneal, and even cut thin sheet metal. The per-piece cost is lower because your labor and consumables are nearly zero.
Here's the no-brainer: If you do more than 50 metal jobs per month, the fiber laser pays for itself in about eight months. I've seen it happen. A client of mine saved $120 per month on marking spray alone. But if you do fewer than 10 metal jobs per month, that fiber laser is a pricey paperweight.
Dimension 2: Material Flexibility vs. Specialization
This is where the xTool S1 shines. Its whole design is modular. You can swap the 40W diode module for a 20W, a 10W, or even the specialized 1064nm infrared laser module for marking plastics and metals. And you can add the rotary attachment, air assist, or honeycomb bed.
- With the xTool S1: One machine handles wood, acrylic, leather, glass, and some metals. For a small business that does custom keychains, signs, and occasionally a stainless steel tumbler, this is a game-changer.
- With a fiber laser: You're effectively locked into metals and some engineered plastics. Can't cut wood. Can't engrave anodized aluminum on a curved bottle without a rotary. It's a specialist. It does one thing very well.
Real talk: If your portfolio is 80% 'soft' materials and 20% metal, the xTool S1 is the smarter buy. My experience from 2023: I took a rush order for 300 leather coasters and 30 metal tumblers. The xTool S1 did both on the same day. It was a no-brainer.
Dimension 3: Engraving Speed & Quality on Metal
This is the dimension that often surprises people. Let's be brutally honest: for deep metal engraving, the fiber laser is 3–5x faster than the xTool S1 40W. If a fiber laser takes 10 minutes to engrave a steel plate, the xTool might take 40 minutes with multiple passes and a coat of marking spray. That's time you can't bill back.
But for surface marking on anodized aluminum or with a marking spray, the xTool S1 40W performs well. The results are clean, permanent, and don't require post-processing. For a 12-oz stainless steel tumbler, the xTool does it in about 15 minutes. A fiber laser does it in 5. The trade-off: the xTool's mark is slightly less durable than a fiber laser's annealed mark (note: still very durable for normal use).
Here's the kicker: I've had clients who wanted a 'vintage' look on a brass plaque. The slower, slightly softer mark from the diode laser actually looked better. It had a subtle texture that the clean fiber mark lacked. So speed isn't everything.
Dimension 4: The 'Emergency Rush' Factor
This is where my job gets interesting. Imagine a client calls at 3 PM on a Thursday, needs 50 custom-engraved aluminum plates for a Friday morning event. How do I triage this?
With the xTool S1 40W: I need marking spray, which I have on hand. I start the first plate while prepping the rest. Total job time: about 5 hours with 10-minute breaks between batches. It's tight, but doable. The risk: if the spray doesn't adhere properly to that batch of aluminum, I lose a hour cleaning and redoing.
With a fiber laser: No spray needed. Each plate takes 2 minutes. The whole job is done in under two hours. I have time for a second cup of coffee. The risk: almost zero. The cost: I had to have the fiber laser in the shop, which cost $6,000.
My honest opinion: If you have the budget and the volume, buy the fiber laser for metal-only rush jobs. If you're a smaller operation, the xTool S1 40W will handle the rush order—but test your spray batch first. (In March 2024, a client's wrong batch of aluminum cost me a $400 express redo because the spray didn't cure. Note to self: always test that batch.)
So, Which One Should You Choose?
Here's my scenario-based advice:
- Choose the xTool S1 40W (with the 1064nm module) if:
- You're a small business owner who does a variety of materials (wood, acrylic, leather, some metal).
- Your metal jobs are less than 30% of your business.
- You value a single machine that can do many things over maximum speed for one task.
- Choose a fiber laser (or CO₂ with rotary) if:
- Metal is your primary or growing material focus.
- You have recurring high-volume orders for metal parts.
- You need to deep-engrave or cut thin metals regularly.
- Stick with non-laser methods (chemical or rotary engraving) if:
- You need deep, tactile engraving on very hard metals (like titanium).
- Your volume is too low to justify a laser investment.
Bottom line: The xTool S1 40W is not a fiber laser replacement. But for many small businesses, it's the Swiss Army knife that gets you 80% of the way there. And sometimes, that 80% is all you need.
