I've been handling laser engraving and cutting orders for small businesses and workshops for over five years now. I've personally made (and documented) at least a dozen significant mistakes on acrylic jobs, totaling roughly $500 in wasted material and client goodwill. The biggest lesson? There's no single "best" setting for cutting acrylic with a desktop laser like the xtool S1. The right answer depends entirely on what you're trying to achieve.
If you're looking for a magic number, you won't find it here. Instead, I'll walk you through the three main scenarios I see, based on hundreds of jobs. My goal isn't to give you one perfect recipe, but to help you figure out which recipe you need.
The Three Scenarios: Speed, Finish, or Precision?
Before you even open your design software, ask yourself: what's the priority for this specific piece?
- Scenario A: The Speed Run. You need a lot of parts, fast. The edges will be hidden, sanded, or flame-polished later. Perfection isn't the goal; throughput is.
- Scenario B: The Showpiece. This is a display item, a sign, or a gift. The edge quality is everything. It needs to be crystal clear and glossy straight off the bed.
- Scenario C: The Detail Work. You're cutting intricate shapes, small text, or very thin features. The risk isn't a rough edge—it's melting the whole detail into a blob.
Picking the wrong approach for your goal is how you waste time and material. I learned that the hard way.
Scenario A: Settings for Maximum Speed
This is for production runs where you're cutting dozens of identical brackets, mounts, or internal parts. The conventional wisdom is to always go slow for quality. My experience with a 200-piece order in late 2023 suggests otherwise—for this specific goal.
The Strategy: Higher power, faster speed, multiple passes. You're trading a slightly frostier or more textured cut edge for dramatically reduced time per piece.
My Go-To Settings (for 3mm Cast Acrylic, 20W Module):
- Power: 85-90%
- Speed: 30-40 mm/s
- Passes: 2-3
- Air Assist: MAX. This is non-negotiable here to clear debris and prevent flare-ups.
The "Why": A faster head movement reduces heat buildup around the cut line. While the cut edge itself might not be laser-polished, you avoid the wider heat-affected zone that can cause warping or bubbling on thin acrylic, which I've seen ruin a whole sheet. The multiple passes ensure you cut all the way through without cranking power to 100% and risking excessive melting.
The Trade-off (and My Mistake): The edges will be frosty. I once used these "production" settings on a batch of 50 clear display stands, thinking the client would polish them. They didn't. The result came back: unusable for their high-end showroom. 50 items, $120 in material, straight to the scrap bin. That's when I learned to always confirm post-processing plans before choosing speed over finish.
Scenario B: Settings for a Flawless Finish
This is for the pieces that need to look perfect right off the machine. Think awards, signage, or decorative elements. Here, edge clarity is king.
The Strategy: Lower power, slower speed, letting the laser's heat actually polish the cut as it goes. This is where the xtool S1's precise control shines.
My Go-To Settings (for 3mm Cast Acrylic, 20W Module):
- Power: 65-75%
- Speed: 8-15 mm/s
- Passes: 1 (maybe 2 on 5mm+)
- Air Assist: Medium. You need enough to prevent fire, but too much can cool the edge and ruin the polish.
The "Why": The slower speed allows the heat to properly melt through the material, creating a smoother, glossier edge—a process sometimes called "laser polishing." Cast acrylic (which you should always use over extruded for laser cutting) vaporizes cleanly, leaving this clear finish.
The Critical Detail: Lens and bed cleanliness are everything here. A dirty lens diffuses the beam, turning your clean cut into a foggy mess. I skipped cleaning the lens because "it was fine last job." That was the one time it mattered. The whole batch had hazy edges. A $80 mistake and a two-day delay to re-cut. Now, a clean before important jobs is on our checklist.
Scenario C: Settings for Fine Details
You're cutting delicate filigree, small letters under 10mm, or very thin connections (under 2mm). The risk is thermal overload—the laser heat spreads and melts the fine feature away.
The Strategy: Very fast, very low power, almost "scribing" the material away with minimal heat transfer. This often feels counterintuitive.
My Go-To Settings (for 3mm Cast Acrylic, 20W Module):
- Power: 30-45%
- Speed: 80-150 mm/s (yes, that fast)
- Passes: 8-15 (this is the key)
- Air Assist: MAX. Critical to whisk away heat with each pass.
The "Why": The high speed means the laser beam touches any single point for a microsecond, depositing a tiny amount of heat. It doesn't have time to spread. By repeating this process many times, you ablate the material away layer by tiny layer without ever letting the surrounding area get hot enough to melt. It's slower overall, but it's the only way to preserve integrity.
The Lesson Learned: I once tried to cut a detailed logo with standard settings. The thin parts of the font melted into oblivion. I had to redesign the whole thing, delaying a client's product launch. The surprise wasn't that it melted—it was how little heat it took. Now, for anything delicate, I default to this high-speed, multi-pass approach. There's something satisfying about peeling a perfect, intricate piece off the bed after watching it make 12 passes.
How to Choose Your Scenario: A Quick Diagnostic
Still unsure? Run down this list:
- Will the edges be visible in the final product? If NO, lean towards Scenario A (Speed). If YES, go to question 2.
- Are you cutting shapes with details thinner than 2mm or text smaller than 10mm? If YES, you're in Scenario C (Detail). If NO, you're in Scenario B (Finish).
- Is the acrylic cast (not extruded)? This is a prerequisite for good cuts. Extruded acrylic melts poorly and can catch fire. Always verify your material.
And finally, always, always test on a scrap piece first. Material batches vary. My documented settings are a starting point, not a guarantee. That 5-minute test could save you a $50 sheet of acrylic. After getting burned twice by assuming settings would transfer, I now budget time and material for a test cut on every new batch. It's the cheapest insurance you can buy.
Remember: The value of the right setting isn't just a good part—it's the certainty. Knowing your job will run correctly the first time is worth more than the 10 minutes you might save guessing. A $20 test piece is always cheaper than a $200 mistake.
