I've Wasted $3,500 on Laser Tests: How to Choose Settings for the xTool F1

About 18 months ago, I submitted a batch of 50 custom keychains for a client order. I'd spent three days fine-tuning the engraving design on my xTool F1 Ultra. Looked perfect on my screen. The result? Every single piece had burn marks on the edges, and the text on the metal plates was barely legible.

The total cost of that mistake? About $890 in wasted materials, plus a week-long delay. I had to redo the entire order, rush shipping included. That's when I learned the hard way: there is no universal setting for a dual-laser machine. The settings that work for one material won't work for another, and sometimes not even for the same material from a different supplier.

Since then, I've personally burnt through about $3,500 in test materials to build a decision framework for the xTool F1 Ultra. This isn't a generic 'try these settings' guide. It's a scenario-based approach, because your specific use case determines the right parameters.

The First Mistake: Assuming 'Laser Settings' Are Universal

After my keychain disaster, I made another classic error. I assumed '20W fiber laser' meant one thing across different machines. I've since learned: never assume the specs tell the whole story.

The xTool F1 Ultra is a 20W combined Fiber and Diode laser system. That's its key advantage—and its biggest source of confusion. The Fiber laser handles metals and some plastics. The Diode laser handles wood, acrylic, and leather. But the power distribution, beam quality, and focal length all vary.

Here's the breakdown of what you're really working with:

• Fiber Laser (1064nm): ~20W peak, 0.05mm spot size, for metal engraving and deep engraving on hard materials.
• Diode Laser (455nm): ~20W peak, 0.08mm x 0.08mm spot size, for wood, acrylic, leather, and some coated metals.

You can't use the same speed or power for plywood as you would for anodized aluminum. It sounds obvious. But in practice, I see people trying it all the time.

After that third batch failure in Q1 2024, I created a pre-check list. It's saved us an estimated $8,000 in potential rework since then.

Scenario A: You're Cutting Plywood (and You Want a Clean Edge)

This is where most of my early mistakes happened. Plywood is tricky because its density varies by grade. Cheap plywood from a hardware store has different glue and filler than premium laser-grade plywood.

On a 1,200-piece order for custom coasters, I once cut 200 pieces before realizing the settings were wrong. The edges were dark, with significant charring. I had to discard 90% of them.

Here's what I've found works for plywood laser cutting with the xTool F1:

• Material thickness: Up to 10mm (3/8 inch) for a clean, single pass.
• Power: 80-95% for the Diode laser. Lower for thin materials.
• Speed: Start at 10 mm/s and adjust down if the cut is incomplete. Speed is the dial you turn for edge quality.
• Air assist: Not optional. You need it. At least 20 L/min airflow. Without it, the edge will be black and rough. I've tested this: same settings, with and without air assist. The difference is night and day.

But here's the kicker: I recommend running a test on a scrap piece before every batch. The same roll of plywood can vary by 0.2mm in thickness. That's enough to change the cut quality. Trust me, I learned this the hard way on a $3,200 order.

What about air assist for plywood?

Since you asked about the keyword 'what does air assist do for laser', I'll be specific. Air assist isn't about cooling. It's about clearing smoke and debris from the cut zone. On plywood, the smoke absorbs laser energy. That reduces cutting efficiency and increases charring. With air assist, you get a cleaner cut, faster, with less burn.

Scenario B: You're Engraving Metal (Fiber Laser Mode)

This is the Fiber laser's territory. But I've seen people try to use the Diode laser for metal engraving and wonder why it barely marks. The Fiber laser is your only option for hard metals like stainless steel or titanium.

For metal engraving (removing material) versus metal marking (changing color), the settings diverge.

• Engraving (deep): Use the 20W Fiber laser at 50-70% power, 5-10 passes. Speed around 20 mm/s. The depth per pass is about 0.01mm. You'll need multiple passes for any visible depth.
• Marking (color change): Lower power (30-50%), higher speed (50-100 mm/s). One pass. This creates a dark mark on stainless steel or anodized aluminum.

I once spent two hours trying to get a deep engrave on a titanium phone case using the wrong settings. I assumed higher power would cut deeper faster. Nope. It just burned the surface. The correct approach was multiple, lower-power passes. The difference was a $450 redo plus a 1-week delivery delay.

Scenario C: You're Working with Acrylic or Polycarbonate

Plastics are where the dual-laser truly shines—and where you can cause the most damage. Not all plastics are laser-safe. Never laser PVC or Vinyl. It releases chlorine gas that will damage your optics and your lungs.

For acrylic:

• Cutting: Use the Diode laser at 60-80% power, speed 8-15 mm/s. You want a 'polished' edge? Reduce speed to 5 mm/s, but increase passes to avoid melting.
• Engraving: 40-60% power, speed 50-80 mm/s. One pass.

For polycarbonate:

• Cutting: Never cut polycarbonate with a Diode laser. It's flammable and produces toxic fumes. The Fiber laser can cut some grades, but it's risky.
• Engraving: Use the Fiber laser for deep marks. Or use masking tape on the surface before engraving to avoid smoke stains.

How to Determine Your Scenario (The 3-Question Test)

This is the most important part. If you can't classify your material, you'll waste time and materials. Here's my test:

1. Is it metal or non-metal? If metal, you're in the Fiber laser zone. Use Fiber settings. If non-metal (wood, plastic, leather), you're in the Diode zone.
2. Is your primary goal cut or engrave/mark? Cutting requires higher power and slower speed. Engraving requires lower power and higher speed.
3. What's the material thickness? For cutting, thickness dictates speed. For engraving, it doesn't matter as much.

I keep a printed checklist at my workstation. After the third major mistake in Q1 2024, I created it. It's caught at least 25 potential errors since.

Why Most Online Guides Are Wrong (and This One Isn't)

Most guides tell you a single 'best' setting. But that's not how it works in the real world. A setting that works for 3mm plywood from one supplier won't work for 3mm plywood from another. The resin content, grain direction, and moisture level all matter.

The real skill isn't memorizing settings. It's understanding your material and running a test. 5 minutes of testing beats 5 days of correction.

In my first year (2022), I made the classic mistake of skipping the test piece. I was in a hurry. The result? A $900 order of custom coasters with edges that looked like they'd been attacked by a beaver. I had to redo them all.

Bottom line: There is no 'perfect' setting for any material. There's only the best setting for your material, your machine, and your desired outcome. Test, test, and test again. It's the cheapest insurance you can buy.