Bottom Line Up Front
If you run a small workshop or creative business and already have an xtool-s1, the 40W laser module is a worthwhile upgrade that significantly expands your material options—but it's not a magic wand. It handles plastics, anodized aluminum, and coated metals for engraving far better than the 20W, and cuts thicker woods and acrylics faster. It will not, however, turn your desktop machine into a steel-cutting workhorse or match the speed of an industrial laser. For the price, it's a powerful tool for prototyping and small-batch production, provided you understand its boundaries.
Why You Should (Maybe) Listen to Me
I manage procurement for a 150-person manufacturing company with a small in-house prototyping shop. My annual budget for tools and workshop supplies is around $85,000 across maybe a dozen vendors. I'm the one who has to justify why we're buying a $1,500 laser module instead of outsourcing, and I'm the one who gets the side-eye from operations if it gathers dust. I've been burned before—like the time I bought a "universal" 3D printer filament that jammed constantly, costing us more in downtime and repairs than the initial savings. So now, I verify capability claims relentlessly.
The Good: Where the 40W Module Actually Shines
Swapping from the stock 20W to the 40W module felt less like a minor upgrade and more like unlocking a new tier of the machine. The difference isn't just about depth or speed; it's about capability.
Plastics and Coated Metals Become Practical
This is the biggest win. With the 20W, engraving on plastics like acrylic or Delrin was finicky. You risked melting instead of vaporizing, leaving a messy, raised edge. The 40W's higher peak power lets you use faster speeds and lower power settings, which gives you a much crisper, cleaner engrave. Same goes for anodized aluminum and painted or coated metals—think nameplates, tool identifiers, or custom signage. The 40W removes the coating cleanly without needing multiple passes that can warp thin materials.
It's tempting to think more power just means cutting thicker wood. But the real game-changer for us was being able to reliably and cleanly mark plastic jigs and aluminum fixtures in-house, saving a 2-week turnaround and $200 per item from an outside shop.
Cutting Efficiency Jumps Noticeably
For 1/4" birch plywood, the 20W might need 2-3 passes at a slow speed. The 40W often cuts through in one pass, or one slow pass followed by a quick cleanup pass. That doesn't just cut job time in half—it reduces charring on the edges because the laser isn't lingering in the same cut line. For 3mm and 5mm acrylic, the cut edge is noticeably smoother and more polished-looking right off the machine.
The Modularity is a Legitimate Advantage
As someone who hates being locked into a single tool, the swappable head design is brilliant. Our shop uses the 40W for most production work but keeps the 20W mounted for quick, low-power engraving on leather or paper (where the 40W can be overkill). Swapping them takes maybe 10 minutes. This flexibility means the base S1 machine feels like a platform, not a one-trick pony.
The Not-So-Good: Reality Checks and Frustrations
The most frustrating part of evaluating tools like this is sifting through marketing hype to find the actual use case. You'd think "40W laser" would have a clear-cut meaning, but performance varies wildly based on cooling, optics, and the machine's overall stability.
Let's Talk About "Cutting Metal"
This is the big one, especially if you're searching for a "steel cutting machine." The xtool-s1 with the 40W module cannot cut through raw steel, aluminum, or brass sheets. Full stop. It can engrave the surface of certain metals if they're coated (painted, anodized) or treated with a marking spray (like Cermark). It's a surface marking tool for metal, not a cutting torch. Any project claiming otherwise is using a different type of laser (fiber) or is flat-out wrong.
It's Still a Desktop Machine
The work area is limited (about 16" x 12"), and while the 40W is faster than the 20W, it's not fast. Cutting a set of intricate 1/4" plywood panels for a small box might still take an hour. For high-volume production, you'd need an industrial machine. The S1 is for prototypes, custom one-offs, and small batches. (And that's okay! Not every tool needs to be for mass production.)
The Learning Curve (and Cost) Continues
The module itself is a cost, but to really use it safely and effectively, you need the proper accessories. We immediately had to budget for:
- An air assist pump: Crucial for cutting acrylic cleanly and preventing flame-ups on wood. The little included air pump isn't enough.
- Better ventilation/extraction: More power means more smoke and fumes. Your little desktop filter might be overwhelmed.
- Material testing time: You will waste material dialing in settings. Every new type of wood or plastic batch requires test runs.
These hidden costs aren't unique to xtool, but they're often omitted from the "just upgrade!" narrative.
Cool Projects It Actually Enables
Forget the generic keychain photos. Here are specific, useful projects the 40W module made feasible for our shop:
- Custom Packaging Inserts: Cutting precise, finger-jointed foam inserts for shipping delicate prototype electronics. The 40W cuts the EVA foam cleanly without the sticky melted edges the 20W produced.
- Durable Tool Shadow Boards: Engraving anodized aluminum sheets to create permanent, easy-to-clean shadow boards for our assembly benches.
- In-House Signage & Labels: Making ADA-compliant braille and tactile signs on plastic, and engraving serial numbers directly onto product housings.
- Jigs and Fixtures: Rapidly cutting and engraving acrylic or MDF jigs for drilling or assembly. We can iterate a design in an afternoon for maybe $5 in material.
Who Should (and Shouldn't) Consider This Upgrade
So, should you buy it? Here's my take, based on managing this asset.
Worth It If:
- You're a small business, maker, or workshop that already uses the S1 regularly and needs to work with plastics or coated metals.
- You do enough cutting that the time savings on wood/acrylic will pay back the module cost in reduced machine time.
- You value the flexibility of swapping between a high-power and low-power laser head for different materials.
Not Worth It If:
- You primarily engrave wood, leather, or paper. The 20W is perfectly capable (and sometimes better for fine detail).
- You expect to cut raw metal. You need a different type of laser entirely.
- You need high-speed, large-format production. You've outgrown the desktop category.
- Your budget is tight and doesn't include the necessary safety/accessory upgrades (air assist, ventilation).
The Final, Honest Verdict
The xtool-s1 40W laser module is a classic example of a tool that is excellent within its well-defined lane. It transforms the S1 from a great wood/leather engraver into a legitimately versatile prototyping and light production tool for a wider range of materials. The modular design is smart and future-proofs your investment.
Just don't believe the hype that it breaks the laws of physics. It's still a 40W diode laser on a desktop gantry. It marks metal, it doesn't cut it. It's faster, but not industrial-fast. If you go in with those expectations—and you have a real business need for engraving plastics or cutting thicker materials—it's probably one of the most cost-effective upgrades you can make to your small shop. If you're hoping for a mini industrial cutter, you'll be disappointed (and out a decent chunk of change).
For our needs? It paid for itself in saved outsourcing costs on custom fixtures and labels in about 4 months. Just make sure you factor in the real total cost—module, air assist, ventilation, and your time to learn it—before you pull the trigger.
