xTool F1 Ultra Cut Metal: The 5-Step Quality Checklist I Actually Use

The xTool F1 Ultra is a 20W fiber & diode laser engraver that gets marketed as a portable metal laser engraver. And it can cut metal. That's not a marketing fantasy. But in my shop, 'can cut metal' and 'cuts metal well enough to ship' are two different things. This isn't a machine problem—it's a process problem.

I'm the quality and compliance manager at a small laser fabrication shop. I review every custom job before it reaches customers, roughly 200+ unique items per year. I've rejected my own work, my coworkers' work, and a few subcontractor batches. In Q1 2024, I rejected 11% of first deliveries. The cause was never 'the machine is bad.' It was skipped steps.

The xTool F1 Ultra does cut metal if you set it up like a quality system. Here's the checklist I run for every metal-cutting job. Five steps, in the order I actually do them.

Step 1: Verify the material before you turn on the laser

Metal is not one material. The F1 Ultra pairs a 20W fiber source with a 20W diode; for bare metal cutting, you need the fiber laser. The diode will mark coated metal, but it won't cut bare metal. The fiber beam also behaves differently on 304 stainless, 6061 aluminum, and brass. At least, that's been my experience with 304 stainless shim stock and 5052 aluminum. If I don't have the material spec sheet, I stop right there.

I check three things:

• Alloy and thickness. Thin shim stock cuts differently from sheet. If I'm close to the machine's rated maximum, I test—I don't assume.
• Surface condition. Plastic film, oil, anodizing, or even a fingerprint in the cut path will change the result.
• Coating direction. Some coated metals have one side that's 'better.' This sounds obvious, but I've caught parts loaded upside down.

The point is to verify, not trust the label. In my first year, I made the classic spec error: I trusted a supplier's 'stainless steel' label and cut a sheet that turned out to have a polymer protective film. Cost me a $600 redo and a missed deadline.

Step 2: Set focus and fixturing before you set power

The usual instinct is to start with power and speed. I start with focus. On thin metal, the difference between a clean cut and a burred edge is often the focal position, not the wattage.

Use the F1 Ultra's focus aid, but verify with a physical test on a scrap piece. If the cut is wider than expected or has excessive dross, check focus again before you blame the settings. If your setup has air assist, check the nozzle alignment now. Metal cutting produces dross; air keeps the cut clear.

Then fixture the part. Metal expands when it cuts. If it can move, it will move. I clamp or tape every corner. Magnets work for steel, but keep them away from the beam path. The surprise wasn't the power required to cut metal. It was how much movement a 'simple' sheet could create while it was being cut.

Checkpoint: the workpiece should not budge when you push it with a screwdriver, not just when you tap it.

Step 3: Run a test grid, not one test line

A single test line doesn't tell you what a cut will do over its full length. I run a grid: three power levels, three speed levels, same focus. Nine cuts. Then I inspect the underside for dross, the edge for roughness, and the kerf width with a caliper.

This is the step I see skipped the most—especially when someone adds a laser beam splitter to increase throughput. A beam splitter divides the beam, and each split path can have a slightly different effective power. I've seen a batch where station one was clean and station two had a ragged edge because the splitter wasn't aligned. The settings were identical. The parts were not.

So after the grid, if your setup includes a laser beam splitter, test each beam individually. Do not assume the split is even.

One note on presets: I do not trust presets. The built-in material presets are a starting point, but they don't know your metal's batch chemistry, surface finish, or ambient temperature. The grid takes ten minutes. The redo takes a week.

Step 4: Verify the first article before batch production

This is where quality work wins or loses. After the test grid, I cut one actual part—not a scrap rectangle, the real geometry. Then I measure it against the drawing. If I changed any variable between the grid and the first part, the test grid result is void.

I check three things:

• Dimensions: the cut edge must be within the tolerance on the drawing. Don't just eyeball it.
• Edge condition: no hanging dross, no excessive recast, no burn-back on the back side.
• Appearance: if it's a brand-facing part, the surface finish matters as much as the dimensions.

I've rejected maybe 40 first articles in the last two years. Maybe 60, I'd have to check the log. The cost of catching a problem here is small; the cost after 50 parts is painful. So glad I caught a bad first article last fall. Almost let the batch run overnight. That would have meant scrapping 80 parts and reordering material.

The first-article check is an efficiency tool, not extra work. It turns 'hope it's right' into 'I know it's right.' That's the difference between a 5-day turnaround and a 2-day turnaround on repeat jobs.

Step 5: Run the batch, check the middle, and write it down

Once the first article passes, I don't walk away. I check the last part of the batch, plus one in the middle. Why the middle? Because that's where tooling, focus, or material feed issues tend to appear after the machine has been running a while.

Write down what you used. I keep a job log with material, thickness, focus, power, speed, frequency, air assist, and which beam splitter station was used. If a customer returns a part in three months, I can tell them exactly how it was made. If we need to reorder, I can match the settings.

When I implemented this protocol in 2022, our rework rate dropped enough that we could take on more jobs with the same staff. I'm not saying it's glamorous. I'm saying it's profitable.

Common mistakes I still catch

• Skipping material verification because it came from the same supplier as last time. Suppliers change process without telling you.
• Using one focus setting for an entire sheet but ignoring thickness variations. Check with a micrometer, not a ruler.
• Letting a beam splitter run without re-testing each station. The split is not permanent. A dirty lens on one path changes the whole part.
• Cleaning the lens with the wrong solution. Mild cleaning residue can leave a film that absorbs beam power. Use the manufacturer's recommended method.

What to do once the checklist is routine

Once this runs smoothly, the machine stops being a toy and starts being a revenue source. Some of the work we've added:

• Custom stainless tags with QR codes. The fiber source marks them permanently. Because the F1 Ultra is a portable metal laser engraver, we also do on-site lots for maintenance crews.
• Branded tools: engraving calipers, knife blades, and small machine parts for local manufacturers. Running them with the rotary attachment is straightforward.
• Color-engraved anodized aluminum samples. If your customer wants a specific brand color, don't rely on the monitor. Use a reference swatch.

Industry standard color tolerance is Delta E < 2 for brand-critical colors. Delta E of 2-4 is noticeable to trained observers; above 4 is visible to most people. Reference: Pantone Color Matching System guidelines.

Those are the unique laser engraving ideas that pay for the machine. But I won't send any of them out the door until the checklist is done. A checklist is a floor, not a ceiling—it doesn't replace understanding the material. It just keeps you from making the same mistake twice.