I Tested the xTool M1 Ultra’s Acrylic Cutting Limits (Spoiler: It’s Not a CO2 Laser, But Here’s When It Worked for a Rush Order)

If you're considering the xTool M1 Ultra for cutting acrylic, here's the short version: it works, but only for thin sheets (3mm or less), and the 'cutting area' is a critical spec you need to understand before you buy. For my last-minute rush order, it was a lifesaver, but only because I knew exactly what I was getting into. Let me explain why, so you don't make the same near-mistake I almost did.

I'm a production manager at a custom sign shop. Last quarter, a client called on a Tuesday afternoon needing 50 acrylic display stands for a trade show the following Monday. Normal lead time from our usual vendor? Two weeks. Our in-house CO2 laser? Down for maintenance. I had a $6,000 contract on the line, and the alternative was either a $2,000 rush fee from a competitor or losing the client entirely.

We own an xTool M1 Ultra primarily for engraving wood prototypes and cutting leather for small runs. I had never seriously considered it for acrylic. But desperate times, right? What I found surprised me, but it also reinforced some hard boundaries.

The Critical Spec: Understanding the 'Cutting Area'

What most people don't realize is that the 'cutting area' on a machine like this—specified as 395mm x 395mm (15.5" x 15.5") for the M1 Ultra—isn't just about physical size. It’s about power density. A 20W diode laser, which is what powers the engraving and cutting on this machine, has to slow down significantly to cut through anything thicker than paper. So while you can fit a 12" x 12" piece of acrylic on the bed, if you need to cut a complex pattern, the effective 'workable area' for a job that needs to be done in an hour is actually smaller. The laser has to make multiple passes, and the material can start to heat up and warp, ruining the cut.

Here's the thing: vendors don't always highlight this. They show the max bed size. The real-world throughput area is a different story, especially for acrylic.

The Acrylic Test: 3mm is the Sweet Spot

My test was simple: I needed to cut 50 pieces of 3mm (1/8") clear cast acrylic. I tested cuts at varying speeds and power levels. Here’s the honest data:

• 1.5mm (1/16") acrylic: Clean cut in one pass. Speed: 10mm/s. Perfect. About 40 seconds per small stand.
• 3mm (1/8") acrylic: Clean cut with two passes. Speed: 5mm/s. It works, but it's slow. About 2 minutes per stand. I had to let the laser cool down after every 10 cuts to avoid melting the edges. Total time for 50 stands: about 3.5 hours of straight machine time. Manageable for a rush order if you plan for it.
• 5mm (3/16") acrylic: Hard pass. The edges became frosted and melted. Multiple passes (4+) started to char the material. The laser simply doesn't have the power density of a 40W CO2 tube. It's not designed for this.

People think that because the M1 Ultra can 'cut acrylic,' it can cut thick acrylic. Actually, the limitation is not the material but the laser power and wavelength. A 20W diode laser at 445nm is great for marking and engraving. For cutting, CO2 (10,600nm) or fiber (1064nm) lasers are an order of magnitude more efficient for thicker materials. The assumption is that a 'laser cutter' is a laser cutter. The reality is that laser type dictates material thickness and capability.

In my opinion, for this specific test, the M1 Ultra is a brilliant laser engraver and a passable thin acrylic cutter. If you're doing a lot of work with 3mm+ acrylic, you need a CO2 laser. Period. But for the occasional rush project with thin material? It's a total godsend.

Budget CO2 Laser vs. The xTool M1 Ultra: A Real-World Comparison

I've tested a budget 40W CO2 laser (think K40 or similar off-brand). It costs about the same as the M1 Ultra ($1,000-$1,500). Here’s where the M1 Ultra beats it:

1. Versatility: The M1 Ultra is a 4-in-1 machine. It can engrave, cut, score, and even print (with the optional print module). A budget CO2 laser is a one-trick pony.
2. Safety & Footprint: The M1 Ultra is enclosed, has a built-in air assist, and can be placed on a desk. A budget CO2 laser needs more ventilation, more space, and often requires a dedicated electrical outlet.
3. Software Ease: xTool's software (xTool Creative Space) is much more user-friendly than the standard open-source software (LightBurn) that budget CO2 lasers usually require. For a small biz owner who isn't a CAD expert, this matters.

But, the budget CO2 laser will cut 6mm acrylic like butter. For a shop that does a lot of acrylic work, the choice is clear. The M1 Ultra is for the maker who does a little of everything. The budget CO2 laser is for the sign maker who just needs to cut acrylic.

Laser Marking vs Engraving: A Quick Note for M1 Ultra Users

With diode lasers, 'marking' and 'engraving' are often used interchangeably, but they shouldn't be. 'Engraving' on the M1 Ultra physically removes material. 'Marking'—like on metal or glass—is actually surface preparation. The M1 Ultra can etch a serial number onto anodized aluminum or leave a frosted mark on glass, but it cannot deeply engrave metal like a fiber laser can. This is a common confusion. If you need deep engraving on steel, a 20W or 30W fiber laser is required.

Boundary Conditions: When NOT to Use the xTool M1 Ultra

I have mixed feelings about the M1 Ultra for acrylic. On one hand, it saved my bacon for that 3mm rush job. On the other, I spent the whole run nervous about the machine overheating or the material quality degrading. For production, that stress isn't sustainable.

So, here's my honest advice:

Buy the xTool M1 Ultra if:

• Your primary use is engraving wood, leather, paper, and acrylic.
• You occasionally need to cut thin acrylic (3mm or less) for small prototypes or small runs.
• You value a compact, versatile, easy-to-use machine for a small studio or home business.

Don't buy it if:

• Your primary need is thick acrylic cutting (anything 5mm+). You need a CO2 laser.
• You have high-volume acrylic production. The speed difference is too big.
• You need to cut metal. This machine is for engraving/marking metal, not cutting it.

I'm not 100% sure if this machine will last for years of heavy acrylic cutting. The diode laser has a rated lifespan, and running it at 100% power for extended periods (like my 3.5 hour session) will degrade it faster. Take this with a grain of salt: for a budget machine used for its intended purpose (engraving), it's a fantastic tool. Don't abuse it like I did. But if you have the knowledge to push its limits for one critical project? It's a gamble that paid off for me.