xTool S1: Which Power Module Should You Actually Buy? (A Cost Analysis Based on My Mistakes)

Three S1 Modules, Three Price Tags, One Hard Lesson

When I first ordered my xTool S1 in early 2024, I assumed the 10W module would handle everything I needed. I mean, it says “laser” on the box, right? Two weeks later, I had a $600 acrylic order sitting in the trash because the 10W couldn’t cut through 5mm clear acrylic cleanly. That mistake taught me something the sales pages don’t emphasize: choosing the wrong power module is the fastest way to waste money.

Here’s what you need to know: the xTool S1 offers three interchangeable laser modules – 10W (blue diode), 20W (blue diode), and 40W (blue diode). On paper, they look like a simple step-up. In practice, the differences are dramatic enough to make or break your shop’s profitability. I’ve now run over 200 test cuts across all three modules, and I’m sharing the real numbers – including the costs I absorbed so you don’t have to.

What We’re Comparing (And Why It Matters)

Dimension 1: Maximum cutting thickness on common materials (acrylic, wood, leather)
Dimension 2: Engraving speed and detail quality on metals (stainless steel, anodized aluminum)
Dimension 3: Total cost of ownership – including hidden costs like reprints, downtime, and accessory upgrades

Each dimension puts the modules head-to-head. No fluff. No “both are good” cop-outs. You’ll see where the 10W saves you pennies but costs you dollars, and where the 40W is overkill.

Dimension 1: Cutting Thickness – Where the 10W Falls Apart

Let’s start with the most common job: acrylic signs. I ordered 100 pieces of 5mm clear acrylic. With the 10W module, each pass took 4 minutes and required 6 passes to get through. That’s 24 minutes per sign. Plus the edges were sooty and needed sanding. The whole order took 40 hours and came out looking mediocre.

Swapped to the 20W module on the same xTool S1 frame. Single pass at 8mm/s, clean edges. Total time for 100 signs: about 12 hours. No sanding needed.

The 40W? Similar speed to the 20W but could slice through 10mm acrylic in one pass – something the 20W needs two passes for. If you regularly work with materials thicker than 6mm, the 40W isn’t a luxury; it’s a necessity.

Bottom line: For most small-to-medium job shop needs, the 20W is the sweet spot. The 10W is only viable for thin materials (up to 3mm acrylic, 4mm basswood) and basic engraving. The 40W is for volume shops cutting thick stock daily.

Dimension 2: Engraving Metal – The Surprise Advantage

“Can it etch stainless steel?” is the question I get most. The answer is yes – but only with the right module. All three can mark metal (stainless steel, anodized aluminum, coated metals) because they use blue diode lasers that create a chemical reaction on the surface. But the speed difference is massive.

• 10W: Engraves stainless steel at about 20mm/s with decent contrast. One full-color 6x4 inch plate: 8 minutes.
• 20W: Same plate in 3.5 minutes. Darker marks, less heat bleed.
• 40W: Same plate in 2 minutes. Almost too powerful – you risk burning the material if not careful with settings.

Here’s the part that surprised me: the 10W actually outperformed the 20W on delicate engraving of thin brass sheets (0.5mm). The lower power reduced the risk of blow-through. So if your primary business is fine-detail engraving on thin metals, don’t assume “more power = better.”

But for most commercial laser etching (dog tags, keychains, nameplates), the 20W gives the best balance of speed and control. The 40W is overkill unless you’re also cutting thick materials – and you’d need the rotary bundle for cylindrical items anyway.

Dimension 3: Total Cost of Ownership – The Hidden Numbers

This is where my “value over price” philosophy kicks in. The 10W module costs about $200 less than the 20W. Sounds like a deal. But let’s look at real costs I tracked over 6 months:

See the trap? The 10W “saves” $200 upfront, but generates $1,050 in extra costs. That $200 savings turned into a $1,500 problem (plus a lot of stress). The 40W adds $300 upfront, but offers negligible extra savings unless you’re cutting 10mm stock regularly.

Question everyone asks: “Should I get the 40W just to future-proof?” Question you should ask: “How much thick material will I actually cut in the next 12 months?” If the answer is “maybe once a month,” the 20W is the no-brainer. The 40W’s extra power is wasted sitting idle.

Real Mistakes – What I Wish I’d Known

Mistake #1: I bought the 10W thinking I could “upgrade later.” True, you can swap modules on the S1. But the 10W module collects dust, and I lost $70 reselling it used. Total cost of that “flexibility” was $270 in lost value.

Mistake #2: I ignored the air assist requirement. Thought I could save money by skipping it. Three engraves later, the soot buildup ruined a $90 order of leather patches. The air assist ($79) paid for itself in one reprint.

Mistake #3: I used the 40W on a batch of 1mm laserable plastic – too much power, melted edges. That was a $120 lesson in “more is not always better.”

So Which Should You Buy?

Here’s my decision framework, hardened by $1,200 worth of screw-ups:

• Go with the 10W if: you primarily engrave (not cut), work with thin materials (<3mm), and your orders are <50 pieces per job. You save $200, but you must accept slower throughput.
• Go with the 20W if: you cut acrylic up to 5mm, engrave common metals, and run mixed jobs. This is the “best for most” option – the $200 extra buys 3x faster cutting + less rework.
• Go with the 40W if: you’re cutting 6mm+ acrylic or thick hardwoods daily, or you operate a high-volume shop where every minute of machine time is profit. The extra $300 is worth it for the time savings.

And one more thing: can you use the xTool S1 for plasma cutting stainless steel? No. That’s a completely different process (plasma cutters use high-temperature ionized gas). The S1 is a diode laser – it engraves and cuts non-metals. Stainless steel gets marked, not cut. Different tool for different jobs.

Final Thought – The Cheapest Option Is Rarely the Most Profitable

I’ve managed 50+ laser projects in the last three years. In 60% of cases, the lowest quote for equipment or consumables ended up costing more. The xTool S1 20W + air assist bundle is, in my experience, the configuration that delivers the highest value for a small business. You pay a bit more upfront, but you sleep better knowing your orders won’t end up in the trash.

Take it from someone who’s already made the mistakes: invest in the module that matches your actual workload, not the one that matches your budget. The $200 difference between 10W and 20W will disappear in your first 10 jobs. The reprint costs won’t.