xTool S1 Batch Metal Engraving: The 7-Step Checklist That Cut Scrap

I've been running metal engraving orders on an xTool S1 from my workshop in the UK for just over three years. In that time I've ruined roughly $1,100 worth of material through bad assumptions, skipped tests, and alignment failures. Every one of those was my fault. None of them happened after this checklist became a habit.

This is for anyone doing batch metal engraving — nameplates, dog tags, industrial labels, machine badges, whatever. If you're making 10 or more identical pieces on an S1, spend the 30 minutes this setup takes. It's cheaper than re-doing the whole batch.

When This Checklist Applies

Use it when:

• The job has 10 or more identical pieces
• The material is metal — anodized aluminum, stainless steel, raw aluminum with marking spray, or coated/painted metal
• You're working to a deadline where rework isn't an option

If it's a single one-off piece, you can skip most of this. The cost of a mistake is small. The moment volume goes up, the cost of being wrong multiplies — and so does the value of ten extra minutes of care.

The 7-Step Batch Engraving Checklist

Step 1: Identify the exact material finish before you touch the software

Anodized aluminum engraves with a clean, light mark at lower power. Raw aluminum barely marks at 10W and needs a marking spray. Stainless steel gives you a dark mark only with higher power or a coating. If you assume the material is the same as the last order, you're gambling.

In September 2023, I assumed an order for "aluminum tags" would be the same finish as the previous run. I didn't verify. Turned out they were bead-blasted aluminum, which reacts differently. The engraving was so faint it was almost invisible. 40 tags, $230 in material, all in the bin.

Checkpoint: Confirm the alloy and finish on the actual workpiece. If it's not identical to something you've already tested, run a small trial before committing.

Step 2: Measure the actual workpieces, not the spec sheet dimensions

Don't trust the nominal size. A "50×50mm" tag is often 49.7mm. When engineering documents insist on consistent waste, the measurement that appears abstract is the one that costs money later. When that error multiplies across a grid, your engraving drifts toward the edge.

In March 2024, I set up a 60-piece order using the supplier's stated dimensions. By row four, the engraving had drifted 0.7mm to the edge. The customer accepted the batch, but the border was visibly clipped. Looking back, I should have measured a few pieces before building the grid. At the time, the spec sheet seemed good enough. It wasn't.

Checkpoint: Measure three random pieces from the actual batch. Use the average as your grid spacing. Keep at least 1mm margin from the edge of each piece.

Step 3: Save a named material profile with proven settings

Once you find a combination of power, speed, and passes that works for a material, save it as a named profile with the date. The S1's modular laser heads (10W, 20W, 40W) all perform differently — don't apply a 20W profile to a 40W head and expect the same result.

Two things that are easy to overlook:

• Power draw. The S1 pulls more power under a heavy engraving pass. If you're running on a long extension reel, voltage drop can lower your actual output. Plug into a wall socket directly, or at least use a properly rated cable.
• Air assist. More air is not always better. On thin aluminum, strong airflow can vibrate the piece mid-engrave and create ghost artifacts in text. Dial it down until the smoke clears but the part stays still.

Checkpoint: The profile you're about to run has been tested on this exact material and finish, with this exact module.

Step 4: Run a sacrificial test piece with the real settings

Non-negotiable. Keep a stack of scrap pieces from previous jobs and run one test with the same file, same focus, same speed, same everything. It takes 90 seconds and costs nothing.

Here's the thing: when you're under deadline pressure, this is the first step people skip. I get it — I've done it. But a 90-second test can save you a 4-hour rerun. In February 2025, a test piece caught a bad batch of marking spray before it ruined $400 of stainless steel tags. The spray looked identical to the old batch. It wasn't.

Checkpoint: The test piece looks good for contrast, clarity, and edge definition — not "sort of okay" under good lighting.

Step 5: Verify focus and height on every new bundle of workpieces

This is the step most people ignore. Laser focus is set for a specific z-height. If a new bundle of workpieces arrives with a different thickness — even 0.3mm — your image will blur.

In Q4 2024, I was 20 pieces into a 120-piece run when the text started to soften. A new bundle of tags had been cut from slightly thinner sheet by the supplier. They looked identical on the stack. They weren't. I had to redo those 20 pieces at 10pm for a Friday delivery.

Checkpoint: For each new bundle, place one piece on the bed and verify focus / z-height before starting the file. It takes 10 seconds.

Step 6: Hold parts still with a magnetic jig — thin metal moves

The S1's honeycomb bed is great, but thin metal pieces are light. A 50mm aluminum tag weighs almost nothing. With a 40W module and the exhaust running, parts can shift mid-job. I once saw a tag rotate about 3 degrees during a batch and ruin its own engraving.

A flat steel plate under the honeycomb plus a few neodymium magnets solves this completely. It cost about $15 and it eliminated my biggest source of alignment drift.

Checkpoint: Push on a test piece gently with a finger. Does it move? Then it will move during the job.

Step 7: Do a first-article inspection before you walk away

The sacrificial test proves the settings. The first-article check proves the jig, the placement, and the workflow. Engrave the first genuine piece, inspect it under normal lighting, and only then start the full run.

Between you and me, this feels redundant after step 4. It isn't. It catches the mistakes that sneak in between testing and production — like a piece sitting slightly differently in the jig, or a file adjustment that shifted the height map.

Checkpoint: The first production piece matches your sacrificial test. If it doesn't, find out why before running any more.

Common Mistakes and What I'd Do Differently

Does the xTool S1 do metal cutting? Know the limits

This is the most common question I get. Most people searching "xtool s1 metal cutting" are hoping for a machine that slices through aluminum plate. The honest answer: the S1 is a diode laser. It engraves metal well with the right finish or marking spray, but it does not cut through metal sheets. If your business is cutting thick steel, a fiber laser or CO₂ system is the right investment. The S1 is excellent for what it does — permanent marking and engraving on flat parts — but it's not a metal cutter.

So what is a laser engraver, after all? It's a machine that uses focused light to alter a surface. Different wavelengths suit different materials. CO₂ lasers handle wood, acrylic, and organics. Fiber lasers are the standard for deep and high-volume metal marking. Diodes, like the S1, sit in between: versatile across many materials, surprisingly good on metal when prepared correctly, but with clear limits on depth and thickness.

If you're searching for a "fiber laser engraver for metal" because you need fast, deep stainless marking at scale — you may genuinely need one. They cost several times more than an S1, but for high-throughput metal work they're the right tool. For what it's worth, as of January 2025 a 20W S1 bundle typically lands in the $900–$1,300 range depending on region and reseller. That's a very different budget decision, and it should be an informed one.

Ventilation and safety — the part the marketing glosses over

Metal marking sprays and coatings produce fumes. The S1 is sold as a compact unit, but it's not a fume-free machine. If you're looking for a laser engraving machine in the UK and intend to use it commercially, an enclosure with extraction is effectively a requirement.

Look, the S1's safety documentation exists and the machine has interlocks. What it doesn't do is set up your ventilation for you. I have mixed feelings about how accessible this information is for first-time buyers. On one hand, everything you need is in the manual. On the other hand, a new owner, excited about engraving, can easily under-configure ventilation and regret it. Set up extraction before your first batch, not after.

Rush jobs and the price of certainty

When a customer says "I need 80 tags by Friday," the temptation is to skip steps to save time. That's exactly backwards. The setup time is what protects your deadline.

In April 2024, I paid $80 extra for next-day shipping on marking spray because my regular supplier was out of stock. It felt like waste. But the alternative was missing a $3,200 order. The rush premium bought certainty — and certainty was worth every cent. For that matter, the first-article check and the sacrificial test do the same thing. They are the cheapest insurance you can buy against a Monday morning rerun.

Final Notes

The xTool S1 can deliver genuinely good batch metal engraving. It can also waste your money, your time, and your reputation if you skip the boring parts. This checklist exists because I skipped them enough that I can't get the scrap back.

I should add: the checklist keeps changing. New module types, new materials, new software behaviors — they all have a way of introducing a mistake I haven't made yet. If something surprises me mid-batch, it becomes a new checkpoint. Your list will end up different from mine. That's fine. The principle is the same: verify first, then run.