How to Get Consistent Cuts on Acrylic & MDF with Your xtool M1 Ultra: A Practical Settings Guide

Why I'm Writing This (and Why You Should Trust It)

I'm an office administrator for a 40-person company. I manage all our equipment and material ordering—roughly $60,000 annually across 8 vendors. When I took over purchasing in 2020, one of my first projects was finding a versatile machine that could handle our prototyping needs without requiring a dedicated engineer.

After evaluating options (and yes, going back and forth between CO2 and diode for two weeks), we landed on the xtool M1 Ultra. The 4-in-1 capability sealed it: laser engraving, laser cutting, blade cutting, and the rotary tool. Not cheap, but cheaper than buying separate machines.

This guide covers three things I wish someone had told me upfront:

1. Exact settings for cutting acrylic (the 'easiest way' isn't what you think)
2. Laser cutting MDF settings that actually work
3. Using the rotary tool for cylindrical projects

These are real numbers that worked consistently for us across multiple projects.

Step 1: Understanding the xtool M1 Ultra's Capabilities

Before diving into settings, you need to know what this machine can and cannot do. From the outside, it looks like a typical desktop laser cutter. The reality is more nuanced.

The xtool M1 Ultra uses a diode laser (not CO2). That matters for material choices:

• Acrylic: Cuts 3mm and 5mm well. 10mm is possible with multiple passes but not recommended for production work.
• MDF: Cuts 3mm and 5mm reliably. Thicker requires slowed speed and multiple passes.
• Metal: Engraves coated metal (like anodized aluminum). Does not cut metal (sorry).
• Wood: Engraves beautifully. Cuts thin (3mm) plywood easily.

Most buyers focus on raw power numbers and completely miss material compatibility. The question everyone asks is 'what's the maximum speed?' The question they should ask is 'what settings produce consistent quality across different materials?' More on that in step two.

Step 2: The Easiest Way to Cut Acrylic (Settings That Work)

This is where I spent the most time testing. 'Easiest' doesn't mean 'fastest.' It means 'fewest failed cuts.'

The Settings (Keep This Handy)

Clear Acrylic (3mm)
Power: 95%
Speed: 5mm/s
Passes: 1
Air Assist: On
Focus: 2.5mm below surface

Clear Acrylic (5mm)
Power: 100%
Speed: 3mm/s
Passes: 2 (let it cool 30 seconds between passes)
Air Assist: On
Focus: 3mm below surface

Why these numbers? Most people assume lower power is safer for acrylic. What they don't see is that underpowered cuts cause more heat buildup. The laser spends too long in one spot, melting the acrylic edges instead of vaporizing them. That's how you get that frosted, rough edge.

I went back and forth between 80% and 95% power for a week. 80% sounded safer. But the melted edges were unacceptable. 95% actually gave cleaner cuts because the material vaporizes faster.

A note on clear vs. colored acrylic: clear acrylic absorbs less laser energy. Colored acrylic (especially black or dark colors) can often cut at slightly higher speeds. Test one piece before committing to a batch.

Step 3: Laser Cutting MDF Settings (The 'Not Plywood' Edition)

MDF is not plywood. It's denser, more uniform, and cuts differently. Using plywood settings on MDF will char the edges and may not cut through.

MDF Settings (Verified)

MDF (3mm)
Power: 100%
Speed: 6mm/s
Passes: 1
Air Assist: On
Focus: 2mm below surface

MDF (5mm)
Power: 100%
Speed: 3mm/s
Passes: 2
Air Assist: On
Focus: 3mm below surface

You'll notice the speed is slower than acrylic. That's normal. MDF requires more energy to vaporize the wood fibers and resin binder. Cutting too fast creates incomplete cuts and burned edges (ugh).

One tip I learned the hard way: tape the surface of MDF with painter's tape before engraving. This reduces smoke residue on the surface. Hit 'confirm' on that recommendation and immediately thought 'fiddling with tape?' But it works. The cleanup time saved is worth it.

According to USPS (usps.com), as of January 2025, standard mail requires envelopes no larger than 6.125" x 11.5". Not directly relevant here, but it's the kind of thing an admin notices. Off-topic, but that's how my brain works.

Step 4: Using the xtool M1 Ultra Rotary Tool for Cylindrical Objects

The rotary tool attachment is what pushed us to buy this over competitors. It's not a gimmick—it's genuinely useful for cylindrical items like tumblers, pens, handles, and small bottles.

Setup Checklist

1. Install the tailstock: Remove the honeycomb worktable and install the rotary tailstock and drive unit.
2. Leveling: Adjust the tailstock height so the center of the object aligns with the laser head. This is the step most people rush. If your object wobbles, the engraving will be distorted. I've seen it happen.
3. Measure diameter accurately: This is critical. In the xtool software, set the roller diameter parameter to your object's actual diameter. Underestimating by even 1mm causes visible distortion at the seams.
4. Test with a disposable item: Engrave a small test design (3mm x 3mm) on a cheap similar object before using your final piece. Check alignment and focus.

Practice Settings (Start Here)

Engraving on coated tumblers (like stainless steel)
Power: 90%
Speed: 3000mm/min
Line interval: 0.08mm
Passes: 1
Rotation speed: 3000rpm

The rotation speed (rpm) matters. Too fast and the laser overexposes. Too slow and you get uneven engraving. 3000rpm is a good baseline for standard-sized tumblers (2.5-3 inch diameter).

Adjust based on your results: If the engraving is too light, increase power to 95% or slow speed to 2500mm/min. If it's burning, reduce power to 85% or increase speed.

Common Mistakes and How to Avoid Them

1. Skipping the Focus Test

After the third late delivery from the same vendor (wait, wrong analogy). After the third failed cut from being just slightly out of focus, I built focus testing into my routine. Always use the focus card included with the machine. Yes, it takes 30 seconds. No, you can't 'eyeball it.'

2. Assuming One Setting Fits All Material Batches

Material varies slightly between batches. That 3mm acrylic from one supplier might actually be 2.8mm. Adjust your focus accordingly. Test cuts are not optional (finally, I learned this).

3. Not Using Air Assist for Cutting

Air assist isn't just for smoke. It reduces charring on edges by blowing away vaporized particles. Without it, your cut quality drops significantly. The xtool M1 Ultra includes it—use it.

4. Overlooking the 'Blade Cutting' Option

For thin materials like paper, cardstock, or thin leather, the blade cutting module is faster and cleaner than laser. It doesn't produce burn marks or fumes. Switch to blade cutting for these materials. I wish I'd realized this earlier.

Final Thoughts

I'd rather spend 10 minutes explaining these settings than deal with mismatched expectations later. The xtool M1 Ultra is a capable machine—I've been responsible for maintaining ours for over a year now—but it rewards careful setup.

Start with these numbers, test on scrap, and adjust from there. An informed customer asks better questions and makes faster decisions. That applies to laser settings as much as any purchase.

A lesson learned the hard way: document your settings. I keep a small laminated card taped to the machine with the numbers I shared above. Saves me from re-testing every time I switch materials.