How to Engrave Metal Under a Deadline: A 5-Step Checklist Using the xtool F1 Ultra’s Fiber Laser

When the clock is ticking and you need metal engraved yesterday

I'm a production manager at a small custom-goods shop. In August 2024, a client called at 3 PM needing 50 stainless steel dog tags for a trade show the next morning. Normal turnaround for metal engraving with a standard CO₂ laser? Zero – CO₂ can't touch metal. With a dedicated fiber laser, maybe 2 days (if you own one). Most shops would panic or outsource for $300+.

We didn't panic. We had the xtool F1 Ultra (the 20W fiber & diode dual-laser model). I had 36 hours to deliver, and I'd already run 200+ rush jobs on this machine. Here's the exact checklist I follow when a metal engraving deadline is breathing down my neck.

Step 1: Verify your material & laser head

First thing: know what you're cutting. The F1 Ultra has two heads – a 20W fiber for metals and a 10W (or 20W) diode for organics. For this guide, I'm assuming you need metal. So:

• Material check: Is it stainless steel, aluminum, or coated metal? Fiber can do all of them, but power settings differ. Quick test: if a magnet sticks, it's likely steel; if not, it's aluminum or brass.
• Head selection: You must use the fiber laser head. I've seen people accidentally leave the diode head on and wonder why nothing happens. I should add: the F1 Ultra's auto-switch firmware is smart, but double-check the laser type in Xtool Creative Space software.

Real talk: I once skipped the material verification because I was in a hurry. The job was supposed to be stainless steel, but the client brought aluminum. Fiber still worked, but I had to adjust the power from 80% to 60% on the fly. Cost me 15 minutes I didn't have. Now I always quiz the client: "What's the exact alloy?"

Step 2: Set your focus – don't trust auto

The F1 Ultra has a neat auto-focus feature (press the button, it measures distance). But for metal engraving under a deadline, I always manually check. Here's why:

1. Auto-focus can be off by 1-2mm if the material has a non-flat surface or protective film.
2. For fiber on metal, the focal depth is tiny – even a 0.5mm error means shallow or blurry engraving.
3. My hack: Use the included focus ruler (it's a small metal strip that comes with the F1 Ultra). Place it on the material, lower the head until the tip touches the ruler, then remove the ruler. This gives you the exact 0.1mm precision needed for crisp metal marks.

I'm not 100% sure why, but the auto-focus seems to misread when the material is dark or reflective. So when I'm racing a deadline, I trust the ruler. (Should mention: it takes 30 seconds. Worth it.)

Step 3: Dial in the right power & speed

This is where most people screw up. The xtool F1 Ultra's 20W fiber laser is powerful, but more power isn't always better. For metal engraving, you want contrast, not depth. Here's a starting point that works in 9 out of 10 cases:

• Stainless steel: Power 75-80%, Speed 150-200 mm/s, Passes: 1 (for deep marks, 2 passes at 90% speed).
• Aluminum: Power 60-70%, Speed 200-250 mm/s. Aluminum absorbs heat faster – too high power will cause micro-melting (looks like grey smudge).
• Coated metal (e.g., anodized): Power 40-50%, Speed 300 mm/s. You only need to burn off the coating for contrast.

If you're under 2 hours to delivery: Use these defaults, but run a 1-inch test square on a scrap piece first. The F1 Ultra only takes 5 seconds to cut a test square. Seriously – don't skip this. I've made that mistake: once engraved 50 tags before noticing the power was 10% too low. Result: invisible marks. Had to redo everything and paid $80 overnight shipping to get replacements. Now I test every time, even when I think I know the settings.

Step 4: Position multiple parts using the rotary tool (if needed)

For cylindrical metal items (like mugs, tubes, or pens), the F1 Ultra's rotary attachment is a lifesaver. But for flat parts, you'll just place them on the honeycomb bed. If you're engraving many small parts (like 50 dog tags), here's a time-saving trick:

Use the "array copy" function in XCS software. Design your engraving once, then duplicate it across the work area (400x400mm on the F1 Ultra). I once did 80 keychains in a single pass – took 12 minutes. Without this, it would've been 15 separate runs. Pro tip: Leave at least 5mm gap between parts to avoid the laser catching on edges.

Step 5: Quick post-processing – how to remove oxide quickly

Metal engraving leaves a dark oxide layer. It's permanent and looks great, but sometimes clients want it wiped clean (especially if it's anodized aluminum where the engraved color should contrast). Here's what I do under time pressure:

1. Wipe with a damp cloth to remove loose particles.
2. If you need a bright white contrast on stainless steel, apply thermal paste before engraving (available at any electronics store). Put a thin layer, engrave, then wash off. The result is a bright mark with no oxide residue. But this adds 10 minutes to the process – only use if the client specifically asks for white marks.
3. For most jobs: just wipe with isopropyl alcohol. The oxide is part of the engraving and is actually more durable.

I'm not 100% sure about this, but I heard the F1 Ultra's fiber can produce oxide-free marks at very low power (30-40%) on stainless. Take that with a grain of salt – I've never tried because the contrast is better with darker marks.

What about the Laserpecker LP5 comparison?

Since this article targets people searching for "laserpecker lp5 vs xtool f1 ultra" – I should mention my experience. The LP5 is also a fiber+diode combo, but it has lower power (2W diode, 5W fiber vs 10W/20W on the F1 Ultra). For metal engraving, the F1 Ultra's 20W fiber cuts faster and deeper. I've used the LP5 for small logos on metal; it works, but takes 3x longer. In a rush scenario, the extra power of the F1 Ultra is what separates a 1-hour job from a 3-hour job.

But I'm not here to trash the LP5. It's a good machine for hobbyists who don't need speed. For my use case (emergency B2B jobs), the F1 Ultra wins. Period.

Common mistakes I've seen (learn from my pain)

• Forgetting to turn on air assist. On metal, air assist blows away molten debris and prevents re-deposition. Without it, the engraved lines get fuzzy. I forgot once and had to sandblast the piece to remove the smudge. Never again.
• Using the wrong lens. The F1 Ultra ships with a standard lens for fiber (around 150mm focal length). If you swap to a different lens for cutting, you'll get different spot size. For engraving, stick with the standard.
• Not securing the material. Light vibration can shift the piece mid-job. Use masking tape or the included magnets to hold it down. I've seen a 1mm shift ruin a whole batch.
• Overestimating the max material thickness. The F1 Ultra can cut thin metal (0.5mm stainless) but not thick. For engraving, thickness doesn't matter. But if you're trying to cut through 2mm steel, you'll need multiple passes and a lot of time. Know the limits.

One last thing: The industry has changed. Five years ago, if you wanted to engrave metal, you needed a $10k+ dedicated fiber laser. Today, the xtool F1 Ultra does it for under $1,500 (at time of writing, based on publicly listed prices, January 2025 – verify current rates). The fundamentals haven't changed – you still need proper focus and power – but the execution has transformed. Small shops can now compete with industrial houses on lead time. That's the evolution I love to see.

Now go save that deadline.