Why Your First xTool F1 Ultra Deep Engraving Might Fail (And How to Save It)

It Was 36 Hours Before the Trade Show

I'm the production lead at a small sign shop. In March 2024, a client called at 3 PM needing 50 custom engraved stainless steel dog tags for a launch event the day after tomorrow. Normal turnaround for a job like that? Five days. We had 36 hours.

I'd just unboxed our new xTool F1 Ultra—a 20W dual laser engraver (fiber + diode) that promised to handle metal, glass, and wood right out of the box. We thought we'd breeze through it. Instead, we almost blew the deadline and ate a $600 rush-fee penalty on a $2,500 job.

The culprit? Deep engraving. Specifically, I hadn't learned a simple truth yet: 5 minutes of verification beats 5 days of correction. That's the lesson I want to share with you today.

The Real Problem Isn't What You Think

The Surface-Level Issue: "It Engraves, But It's Not Deep Enough"

If you've ever tried deep engraving on the xTool F1 Ultra—especially on metal or glass—you've probably hit this wall. The first pass looks promising. The second pass is ok. But after 10 passes, the depth is still shallow, and the edges look burnt or fuzzy.

Most people assume the solution is simple: crank up the power, slow down the speed, do more passes. But that's a trap. It's tempting to think more power equals more depth. But the simplification of "just run it harder" ignores the nuance of how a dual-laser source actually interacts with different materials.

The Deeper, Hidden Issue: Material Physics, Not Machine Limits

The xTool F1 Ultra has a 20W fiber laser and a 20W diode laser. The fiber laser is great for metal marking, but deep engraving requires material removal, not just surface marking. The diode laser handles organics (wood, acrylic) well but struggles with reflective surfaces like glass without the right focus.

Here's what I missed: deep engraving is a function of focus depth and material vaporization rate, not just laser power. The machine can deliver the energy, but if the laser isn't focused properly for the z-height, or if you're using the wrong laser source for the material, you get shallow results—no matter how many passes you run.

I only believed this after ignoring it. We ran 30 passes on a stainless steel dog tag with the diode laser (thinking "more power = more depth"). The result? A shallow, heat-affected mark that looked terrible. We wasted 4 hours of production time. That's when I realized: the question everyone asks is "how many passes do I need?" The question they should ask is "what's the correct laser source and focus for this material?"

The Cost of Getting It Wrong

Let me give you a concrete example. Last quarter alone, we processed 47 rush orders. Three of those involved deep engraving on the xTool F1 Ultra. Two went perfectly. One—the dog tag job—almost failed.

Here's the financial breakdown:

• Base job cost: $2,500 (50 tags, design, setup, shipping)
• Rush fee if delayed: $600 penalty plus lost future business
• Time wasted on wrong settings: 4 hours (costing us ~$200 in labor)
• Material wasted: 12 tags ruined due to shallow engraving ($24)
• Real cost of our mistake: $224 + the risk of $600 penalty

If we'd spent 15 minutes upfront verifying the correct laser source (fiber for stainless steel), focus distance (exactly 0.5mm below surface), and power/speed curve, we'd have saved that time and money. The upside was saving $224. The risk was losing a client. I kept asking myself: is $224 worth potentially losing a $2,500 client? The answer was obvious—after the fact.

How to Fix It: A Prevention-First Approach

The 5-Minute Verification Checklist

After that failed dog tag job, I created a checklist. It's saved us an estimated $8,000 in potential rework in just six months. Here's what it covers:

1. Confirm material type — Is it metal (use fiber laser) or organic/acrylic (use diode laser)? Glass? Use diode with defocused setting.
2. Set the correct focus — For deep engraving, start with the manufacturer's recommended focal distance for the material. For the xTool F1 Ultra, that's usually 2.5mm from the surface for fiber, 1.5mm for diode. Adjust based on your test pass.
3. Run a single test pass on a scrap piece. Check depth, edge clarity, and heat marks. If it's not clean, adjust power and speed before adding more passes.
4. Don't exceed 10 passes without checking focus again—laser vaporization can shift the focal point.
5. Use the rotary tool for cylindrical surfaces (like wine glasses or pens). It's a no-brainer for consistent depth.

One More Thing: Power Consumption Matters

A lot of folks ask about the xTool F1 Ultra power consumption in watts. The unit draws about 120W max at full load (20W for each laser, plus electronics and cooling). But here's the blind spot: deep engraving at high power for long periods can trigger thermal protection on the cooling system. I've seen it happen when we ran 30 consecutive passes at 100% power. The machine shut down mid-job. That's a deal-breaker for rush orders.

So my advice? Run at 80% power, not 100%. You'll get similar depth with less thermal stress, and you can run more passes back-to-back without cooldowns. It's a small trade-off for reliability.

Final Thoughts

Looking back, I should have invested 15 minutes in testing before jumping into production. But at the time, the deadline pressure made me think speed was the priority. I was wrong. Speed comes from preparation, not shortcuts.

The xTool F1 Ultra is a capable machine—especially for deep engraving on metal and glass. But like any tool, it rewards those who respect its limits. A simple checklist, a test pass, and understanding the difference between fiber and diode applications can save you hours of rework and hundreds of dollars.

Take it from someone who learned the hard way: the 12-point checklist I created after that mistake has saved us an estimated $8,000 in potential rework. That's a lot of dog tags.