xTool F1 Ultra Laser Engraver: Bed Size, Plexiglass, Wood, and Jewelry Engraving FAQ

If you're comparing the xTool F1 Ultra laser engraver with other machines, this FAQ is for you. I run a small engraving shop, and I've been doing this since 2017. In that time, I've personally made 14 significant mistakes that added up to about $4,200 in wasted material and rework. Now I keep a checklist so I don't repeat them. These are the questions I wish someone had answered before I hit 'buy.'

What is the xTool F1 Ultra bed size?

The official bed size is 150 x 150 mm. I measured mine before the first run and got 148 x 149 mm of safe work area. Close, but not exact. Why does this matter? Because I assumed 150 x 150 was the usable number. I cut a 150 mm square of 3 mm plywood, and it didn't fit. It caught on the side. I had to sand it down and cut it again.

The other thing nobody tells you: clamps, tape, and the rotary attachment shrink that space. If you're using the rotary chuck, you won't get 150 mm across. Plan for about 140 x 140 mm of usable area with fixtures. That's not a flaw. It's just reality.

According to xTool's published spec sheet (January 2025), the F1 Ultra pairs a 20W fiber laser with a 20W diode laser in a 150 x 150 mm bed. I don't work for xTool. I just own one.

Is the xTool F1 Ultra a good laser cutter for plexiglass?

'Plexiglass' is a brand name for acrylic. Acrylic is a weird material for a dual-laser. The fiber laser won't cut it—that source is mainly for metal marking. The 20W diode laser can cut thin acrylic, but only if the material absorbs the beam. Clear acrylic doesn't absorb it well.

My failure: I tried clear 3 mm acrylic at normal speed. The beam went straight through. Nothing. I assumed a laser cutter for plexiglass meant any plexiglass. Learned never to assume. If someone asks for 'plexiglass cutting' without saying color or type, that's a red flag.

For 3 mm black extruded acrylic, I start at 80% power, 10 mm/s speed, and two passes with air assist. That's a starting point, not gospel. Test a corner before you cut a full sheet.

What materials are actually safe to cut and engrave with the F1 Ultra?

The F1 Ultra is really two tools in one. The diode laser handles wood, bamboo, leather, paper, painted acrylic, slate, stone, and glass when coated. The fiber laser handles metal, some plastics, and certain ceramics. My rule: when in doubt, test. I learned that copper and brass often need a marking spray because bare copper doesn't absorb the 1064 nm wavelength well.

One material I avoid completely: PVC. Cutting PVC releases chlorine gas, and that's not something you want near your face or your lungs. Not a rumor. Chemistry. If someone sells you 'laser-safe vinyl' that actually has PVC in it, send it back.

The question isn't 'Can it cut?' It's 'Can it cut your material?'

Cutting tools for wood: what actually works with the F1 Ultra?

Yes, the F1 Ultra can cut wood, but 'cutting tool' doesn't mean 'saw.' The 20W diode laser will cut wood up to about 8 mm in my experience. Balsa, basswood, thin plywood, and MDF are the easiest. Harder woods like oak and maple cut slower and leave more soot. My worst mistake: 12 mm pine in one pass. It charred, smoked, and the edge looked like burnt toast. The piece was trash.

The fix is multiple passes or a lower speed. Better yet, don't treat the F1 Ultra as a lumber mill. If you're regularly cutting thick wood, get a CO2 laser or a bandsaw. Laser cutting is great, but it's a heat-based cutting tool. Kerf and charring come with the territory.

Bottom line: for thin wood, the F1 Ultra is a solid tool. For thick wood, it's the wrong tool.

Is the F1 Ultra a good jewelry engraving machine for sale?

If you're searching for a jewelry engraving machine for sale, here's what I wish someone told me: the upgrade from diode to fiber is the big deal for metals. The F1 Ultra includes a 20W fiber laser. That's why it can mark sterling silver, gold, stainless steel, brass, and titanium without sprays or marking compounds.

I started with a diode-only machine in 2019 and assumed it would engrave a bare gold ring. It didn't. I had to send the ring out and lose the job. The fiber source on the F1 Ultra is why I bought mine. Since then, I've engraved dozens of rings, bracelets, and dog tags. It's not a deep metal mill—it's a marking and engraving tool. If you need deep 1 mm cuts into metal, this isn't that machine.

Even after choosing the F1 Ultra, I kept second-guessing. What if it couldn't engrave fine text? The two weeks until delivery were stressful. I didn't relax until the first ring blank came out clean. For a small shop wanting to add jewelry engraving as an income stream, it's a no-brainer. Just use the rotary attachment for rings and verify focal height every time.

Do I need the rotary attachment and air assist?

You'll want both. I tried engraving a ring without the rotary attachment and got a wobble. Not ideal, but workable after I added a clamp. The rotary tool holds the ring and rotates it under the laser for even marks. Air assist isn't just a fan—it blows smoke away and reduces scorching on wood and acrylic. Huge difference in cleanup.

One caution: every fixture changes your bed size. The rotary chuck takes up space. If you switch between flat sheets and rings, set a quick-release system or a checklist so you don't forget to reset the focal length. I forgot once. The design came out fuzzy, and I had to start over. That mistake cost me 3 hours and $60 in brass blanks.

What mistakes should I avoid with the xTool F1 Ultra?

In six years, I've made 14 mistakes that cost about $4,200. Most were avoidable. The ones that matter:

• Assume nothing. Measure bed size, focal height, and material thickness before starting.
• Test on scrap. A 10-minute test saves a 2-hour fix.
• Use a checklist. My 12-point checklist has caught 47 potential errors in the last 18 months. It's the cheapest insurance I have.
• Don't force one machine to do everything. The F1 Ultra is versatile, but a CO2 laser still cuts thicker acrylic and wood better.

Why do I write this? Because 5 minutes of verification beats 5 days of correction. That's not a slogan. That's math.