I've been managing equipment purchases for our office for over five years now. When we decided to bring a laser engraver in-house for small batch custom work—nameplates, labels, that sort of thing—the xTool S1 seemed like the perfect fit. It promised versatility, modularity, and the ability to handle a wide range of materials. And honestly, it's been great for most of them.
But the first time someone from marketing asked if we could engrave their logo on a stainless steel water bottle, I hit a wall. The sales material says 'metal.' Google says 'xTool S1 can engrave metal.' But when I tried it, all I got was a faint, ghostly mark that wiped off with a thumbprint. I knew there was a trick to it, but the sheer volume of conflicting information online—'just use masking tape,' 'you need a higher power module,' 'it's all about the speed'—was overwhelming. It felt like everyone knew a secret I didn't.
This article isn't a comprehensive guide on how to set up your machine. It's about why you're probably failing, and it's based on my own journey from frustration to a (mostly) reliable process. My experience is based on managing a single xTool S1 unit for our office of 15 people. If you're running a high-volume production line, your experience will be different.
The Surface Problem: It's Not Just 'Laser Power'
The most common piece of advice I saw was 'you need more power.' So I bought the 40W module. The result? Slightly less faint marks. The confusion is that when we say 'can engrave metal' in the laser world, we're not talking about removing material like a plasma cutter. That's a whole different process (metal plasma cutting, which uses a different kind of torch). Laser engraving on metal, especially with a diode laser like the xTool S1, is about burning a mark onto a coating or a surface layer, or using an additive like a marking spray.
Honestly, I'm not a physicist. I have no idea why a 10W, 20W, and 40W module produce such similar results on a bare piece of aluminum. My best guess is that the fundamental interaction of the light with the metal's reflective surface doesn't change at those wattages unless you're doing something specific to trap that energy. The real problem wasn't power. It was expectation.
The Misunderstood 'Metal' Capability
When I first started, I thought 'capable of engraving metal' meant direct, high-contrast marks on steel or aluminum. That's what everyone wants, right? But a lot of the articles and forum posts are talking about anodized aluminum (where you're removing a surface coating to reveal the bare metal), or using a special marking spray that fuses with the metal. No one just uses raw power to cut into a steel plate with a 20W diode. That's not how it works.
I learned this the hard way when I was trying to engrave a simple serial number on a piece of raw steel. Fifty attempts, fifty failures. It wasn't until a vendor said 'this isn't our strength—here's who does it better' for a different project that I realized the importance of understanding where your tool's expertise lies. The xTool S1 is a champion at wood, acrylic, leather, and coated metals. It is not a fiber laser. And that's okay. A specialized tool for the wrong job is just frustration.
The Hidden Costs of a 'Trial and Error' Approach
This leads to what I call the 'experimentation tax.' When you don't understand the boundaries of your tool, you waste time and materials. In my first year of managing the laser engraver, I must have gone through $200 worth of scrap metal and marking sprays trying to find a magic setting that would work on everything. I knew I should have spent a day just doing a standardized test grid, but I thought 'what are the odds this piece of brass is that different from the last one?' Well, the odds caught up with me pretty much every time.
This isn't just about money; it's about credibility. When marketing asks for 50 custom metal bookmarks for a client gift and you deliver them with a washed-out, barely visible mark, it makes you look incompetent. That unreliable machine (and your process) cost you more than just the materials. It cost you internal trust. I've learned that planning for setup and testing is just as important as the run itself.
The Deeper Reason: Expecting a 'One-Size-Fits-All' Solution
So, what's the real issue? It's the assumption that a single tool can be the master of all trades. The xTool S1 is an incredible machine for its category. But its 'metal' capability is specific, conditional, and often requires additives or specific surface preparations. The promise of 'multi-material capability' can lead a buyer to believe they're getting a universal solution, which is a dangerous expectation for any capital equipment purchase.
I've seen it happen with other vendors and equipment, too. The one who promises they can handle every project perfectly is often the one who misses deadlines or delivers substandard work. The vendor who says 'this isn't our strength—we specialize in this, and for that, you should talk to so-and-so' earns my trust for everything else. The xTool S1's own ecosystem is a good example: they have the P2 for large format CO₂ work, and the M1 for hybrid cutting (blade + laser). They know their boundaries. We should, too.
So, What Actually Works? (The Short Version)
Here's what I eventually learned, after all the trial and error. It's not a long list, because the problem wasn't a lack of options—it was too much noise.
- Use a marking spray or metal marking sheets. Brands like Enduramark or LaserBond work wonders on stainless steel, aluminum, and even glass. This fuses a black, permanent mark into the surface.
- For anodized aluminum, treat it like coated material. Use high speed and low power. You're not engraving the metal; you're blasting off the colored anodization.
- Stop trying to cut metal. This is not a plasma cutter. Keep it to engraving surface marks.
- Run a proper test grid. One file, multiple combinations of speed and power on a small sample of your actual material. It takes 30 minutes but saves hours of frustration.
That's it. The solution wasn't about finding the magic $500 accessory. It was about accepting the machine's boundaries and working within them. For our 80% of work—wood, acrylic, leather—the xTool S1 is a dream. For that last 20%, we now have a clear process and a clear expectation. And that's worth more than any universal 'metal engraving' claim.
