I've been running a small prototyping shop since 2019. By 2022, I'd wasted roughly $1,200 on wrong laser settings, ruined materials, and re-dos. The xtool F1 Ultra (fiber + diode dual laser) is a powerful machine, but it's also extremely easy to mess things up if you treat it like a one-size-fits-all tool. This guide is the checklist I wish someone had handed me before I started.
There's No 'Universal' Setting – Here's How to Decide
The F1 Ultra's 20W dual laser can handle stainless steel, colored engraving, leather, and cardboard – but the right settings depend entirely on material type, thickness, and your finish goal. Trying to use the same power/speed for everything is a guaranteed disaster (ask me how I know). Below are the four most common scenarios I encounter, with settings that actually work (after 47+ documented failures).
Scenario A: Cutting Stainless Steel (0.5–1mm)
This is where the fiber laser shines. But I burned through three test sheets before getting a clean edge.
- My go‑to starting point: 80% power, 10 mm/s, 1 pass. Fiber laser, focus at 0.15 mm above surface (yes, that tiny offset matters).
- Watch out: If you see a yellow/blue flame, you're too slow – reduce passes or increase speed. I learned this after a $90 sheet of 0.8mm stainless warped because I used 5 mm/s (note to self: patience is cheaper than replacements).
- Edge quality tip: For polished edges, run a second pass at 50% power, 15 mm/s with air assist on. Otherwise you'll get dross that requires sanding.
One caveat: this works for thin stainless (≤1 mm). If you're cutting 2mm plates, you'll need multiple passes and might still get incomplete cuts – the F1 Ultra's fiber is only 20W. I've stopped accepting orders above 1.5 mm after the third failure (ugh).
Scenario B: Color Engraving on Anodized Aluminum / Coated Metals
Color marking is the feature that sold me on the F1 Ultra. But the colors you get depend heavily on the coating. I wasted a whole batch of anodized aluminum tags because I used the same settings as for stainless engraving.
- For dark colors (black/dark blue): 20% power, 200 mm/s, fiber laser, 0.2 mm focus offset. This removes the anodized layer evenly, revealing the base aluminum.
- For bright colors (gold/red): You'll need to use a marking spray (e.g., CerMark) on bare metal. 30% power, 100 mm/s, 1 pass. Spray thickness matters – too thin and the color is patchy; too thick and it bubbles. I've ruined roughly $150 worth of samples dialing this in (part of me wishes I'd just bought the pre‑coated blanks).
- Don't expect Pantone‑level accuracy. The color is more 'burned stain' than paint. For brand‑critical work, I still outsource to a chemical etching shop.
Side note: if you're engraving glass, the fiber laser won't color it – you need the diode laser. That's a whole other setup (tight focus, low power, multiple passes). See my separate guide on glass engraving.
Scenario C: Engraving Leather (Natural / Vegetable Tanned)
Leather engraving is much trickier than I expected. The diode laser (455 nm) works best, but the results vary wildly by leather type.
- Natural veg‑tan leather: 30% power, 250 mm/s. This gives a clean, dark brown mark without burning through. I tried 50% once and got a hole the size of a dime (thankfully it was just a scrap).
- Chrome‑tanned / finished leather: Forget it. The chemicals in the finish cause uneven burning and nasty fumes. For chrome‑tan, I only use the fiber laser to mark the back side (where the finish is absent).
- Air assist is mandatory: Without it, the smoke residue sticks to the surface and discolors the engraving. I skipped it on my first three leather projects and had to resand each one. Never again (mental note: always enable air assist for organic materials).
Scenario D: Cutting Cardboard (Corrugated / Kraft)
This is the easiest, but also the area where people overthink it. Cardboard cuts beautifully with the diode laser at low power.
- Standard corrugated (single wall): 15% power, 50 mm/s, 1 pass. Diode laser, air assist off (it's not needed).
- Thick double‑wall: 20% power, 30 mm/s, 1 pass. The edges will be slightly charred – that's normal. If you want cleaner edges, run a second pass at 10% power, 100 mm/s.
- Speed tip: Use a honeycomb bed and mask the bottom side with transfer tape to reduce burn marks on the reverse. I learned this after a client complained about soot on the inside of a custom box (ugh).
How to Tell Which Scenario You're In
If you're new to the F1 Ultra, start with Scenario D (cardboard) to get comfortable with the workflow. Then move to leather, then metal, then color marking. Each step teaches you something about focus, speed, and power interaction. I can't give you a single magic table, because your material batch might differ from mine (especially leather finishes and metal coatings). Here's a quick decision framework:
- Is the material opaque and conductive? → Use fiber laser → Scenario A if cutting, Scenario B if marking.
- Is it organic (leather, wood, fabric)? → Use diode laser → Scenario C.
- Is it thin, cheap, and for prototyping? → Diode laser, low power → Scenario D.
- Unsure? → Cut a 1×1 inch test square at 10% power increments from 10% to 50%. Document the best setting. I have a folder of 30+ test pieces on my desk – they're ugly, but they've saved me hundreds of dollars.
One final thing: don't be afraid to fail. The F1 Ultra is durable; I've run it at 100% power on accident (wrong material selected) and it survived. The cost is in wasted materials, not the machine. So document your mistakes, keep a notebook of settings per material, and share what you learn. That's the whole reason I wrote this – so you don't repeat my $1,200 lesson.
