The Day I Got Too Comfortable
It was a Tuesday in September 2022. I was handling a custom order for a local Toronto brewery—50 anodized aluminum tap handles, each needing their logo and a batch number engraved. The client was specific: deep, crisp, and perfectly legible marks. My XTool S1 with its 20W diode laser module had handled wood and acrylic like a champ for months. I’d even done some successful light marking on coated metals. I figured aluminum would be fine. I was way too confident.
I loaded the file, set the honeycomb bed, and ran my usual pre-flight: focus check, air assist on, ventilation running. The first handle came out… okay. The mark was there, but it was faint, almost gray instead of the stark black I expected. “Maybe the power’s a bit low,” I thought. So, I bumped the power from 80% to 95% and increased the passes from one to three. I didn’t re-check the focus. I didn’t think about heat buildup on a metal surface. Big mistake.
What I mean is that with a desktop laser like the S1, you’re not just dealing with material compatibility on paper—you’re wrestling with physics. Diode lasers, especially at the 20W/40W range, interact with metal differently than CO2 lasers do. They need the right surface treatment (like a coating) and perfect parameters to create a contrast mark without just heating and potentially warping the piece. I learned that the hard way.
The Sound That Made My Stomach Drop
By the third tap handle, I heard it. A faint, high-pitched ping. I stopped the job immediately and pulled the piece off the honeycomb bed. The engraving was deeper, but the area around it had a slight discoloration—a heat-affected zone. And the handle itself felt warmer than it should. The fourth piece, which had been sitting under the laser while I inspected the third, showed the beginnings of the same issue.
I had 47 pieces left to go in a $3,200 order. If I warped or thermally damaged even a few, the whole batch would be unusable. The client needed consistency. Panic set in. I’d assumed “engrave metal” was a binary setting on the machine. It’s not. It’s a process.
Where I Went Wrong: The Three Assumptions
In my rush, I broke every rule I now teach our new hires:
- The Material Assumption: I treated “anodized aluminum” like a single material. Anodizing thickness and dye quality vary wildly. My settings for one batch weren’t universal.
- The “More Power” Fallacy: Cranking up power and passes without a test is a recipe for disaster on metal. Heat dissipates differently, and you can ruin the material’s temper or finish.
- The Focus Neglect: After adjusting the bed or material, re-focusing is non-negotiable. A fraction of a millimeter off can turn a clean engrave into a blurred burn.
Seriously, that moment of realizing I might have just turned $600 worth of hardware into scrap was a wake-up call. The honeycomb bed, which is fantastic for airflow and preventing back-scatter on woods, doesn’t dissipate heat from metal the same way. The metal just sits there and soaks it up.
The Salvage Operation & The Birth of a Checklist
I stopped everything. I took the four test pieces, including the slightly discolored ones, to the client. I explained the issue, showed them the results, and proposed a solution: a full, documented test matrix on scrap material from their exact batch before touching the remaining stock. They agreed, albeit with a tightened deadline.
That afternoon, I created what we now call the “Metal Engraving Pre-Flight Checklist.” It’s saved us from countless errors since. Here’s the core of it:
- 1. Material Verification: Is it actually laser-engravable? Bare, polished metals rarely work with diode/CO2 lasers. We need a coating (paint, anodizing, Cermark/LaserBond spray). If a client says “engrave stainless steel,” we ask for a sample or specify the necessary coating.
- 2. The Mandatory Test Square: No job runs without a test on an identical scrap piece or a hidden area. We test for power (start low!), speed, passes, and focus. We look for clarity, contrast, and—critically—check for heat damage on the reverse side.
- 3. Focus, Then Lock: Focus is set after the material is secured and level. If we adjust anything, we re-check focus. Period.
- 4. Heat Management Protocol: For metal, we use longer pauses between passes if doing multiples. We monitor the piece temperature by hand. If it’s getting hot, we stop and let it cool.
- 5. Final Visual Inspection (First Piece): The first piece off the bed gets a magnifying glass review and a physical feel. Is the mark crisp? Is the material warped? Only then does the batch run.
Using this checklist, we salvaged the brewery job. The test revealed the anodizing was thinner than usual. We ended up using lower power (70%), higher speed, and two passes with a cooling period between. The results were perfect. We delivered on time, but I ate the cost of the test time and the four initial pieces. A $450 lesson.
Honestly, I’m not sure why the “more power” instinct is so strong with lasers. My best guess is that with materials like wood, it often works. With metal, it’s usually the fastest path to a ruined part. The learning curve isn’t about operating the XTool S1—it’s about understanding the marriage between the tool and the material.
What This Taught Me About “Can the XTool S1 Engrave Metal?”
So, can the XTool S1 engrave metal? The answer is nuanced, which is the only honest answer in this business.
Yes, but with critical caveats: The XTool S1 (with diode or CO2 modules) can mark coated metals exceptionally well. This includes anodized aluminum, painted steel, or metals treated with a specialty marking spray like Cermark. It creates a high-contrast, permanent mark by altering the coating, not by vaporizing the base metal like a fiber laser. For a small business or workshop doing signage, personalized items, or industrial labels on treated metals, it’s a capable tool.
No, if you mean traditional deep engraving: It will not carve into raw, untreated steel, titanium, or brass. That requires a fiber laser, which is a different technology and price point altogether. Anyone who says a desktop diode/CO2 laser can do that is setting you up for my same $450 mistake.
The old thinking that “desktop lasers are only for crafts” comes from an era of weaker, less accessible lasers. Today, a 40W module on an S1 is a serious tool. But with that power comes the responsibility to know its boundaries. My near-disaster wasn’t the machine’s fault. It was mine, for not respecting the process.
For Anyone in Toronto (or Anywhere) Starting Out
If you’re in Toronto looking at laser engraving services or running your own S1, here’s my hard-earned advice: Your output quality is your brand. A blurred, heat-damaged engraving on a corporate gift tells the client you don’t understand your own tools. The $50 bottle of proper marking spray or the 30 minutes spent running test grids isn’t a cost—it’s insurance for your reputation.
We’ve caught 47 potential material or setting errors using this checklist in the past 18 months. That’s thousands of dollars and countless client relationships preserved. The checklist is simple. Use it. Your future self, staring down a $3,200 order on a Tuesday, will thank you.
Bottom line: The XTool S1 is versatile, but it’s not magic. Respect the material, test everything, and never assume. That’s the only way to turn “can it engrave metal?” from a risky question into a reliable service.
