My Laser Cutting Materials Guide (Built from 47 Blown Orders)

If you're new to the Ortur ecosystem—or even if you've had your Laser Master 2 or 3 for a while—you've probably Googled "can my Ortur cut this?" about a hundred times. I know I did. And I paid for it. Literally.

This is the checklist I now use before every single order I run on my machines. It's built from roughly $2,400 in wasted material and a lot of late-night frustration over the last couple of years. It's not a theory piece. It's a "do this, in order, and you won't make my mistakes" guide.

Let's get into it. This is a 5-step checklist for verifying if a material will actually work on your desktop diode laser.

Step 1: The ABS & PVC Test (Do Not Skip This)

This is the first check. Not the third. The first. I almost burned down my workshop in September 2023 because I grabbed a piece of what I thought was acrylic from a mixed bin. Turns out it was PVC. The smell was immediate, the smoke was acrid, and the residue on the laser lens took an hour to clean. The machine was fine.

The test: Before you put anything on the bed, look at the label or spec sheet. If it says ABS, PVC, Polycarbonate, or Vinyl, stop. These materials create chlorine gas or melt into a sticky, destructive mess. Diode lasers don't have the power to vaporize these plastics cleanly. They just melt and burn them.

• Safe for Ortur: Acrylic (cast or extruded, but more on that in Step 2), Wood, Leather, MDF, Cardboard, Paper, Slate, Stone, Glass (with marking spray), Anodized Aluminum (marking only).
• Unsafe (Do Not Cut): PVC, ABS, Polycarbonate, Vinyl, Fiberglass, Carbon Fiber (particles are conductive and can short electronics).

Check your material. Even if it looks like acrylic, if it smells like a pool hall when it burns, you have a problem.

Step 2: The Acrylic Spec Check (Cast vs. Extruded)

Most people buying a desktop engraver for cutting acrylic assume all clear sheets are the same. I used to think that too. I was wrong.

On my Laser Master 3 (at about 90% power, 400mm/min), a 3mm sheet of clear cast acrylic cuts like butter. The edges come out clear and flame-polished. It's a dream.

A 3mm sheet of extruded acrylic? It's hit or miss. It tends to craze (develop small cracks) at the cut edge. It doesn't get that clean, clear edge. It looks frosted and stressed. I learned this on a $320 order of custom displays. Every single cut edge was cracked.

• Cast Acrylic: Best for cutting. Edges are clear. More expensive. Fragile under stress, but perfect for laser work.
• Extruded Acrylic: Best for engraving. Cheaper. Heat from the laser causes internal stress, leading to cloudy/cracked cuts. Don't try to cut intricate shapes with it on a 10W diode.

How to tell the difference at the store: Look at the protective masking. If it has a blue or clear plastic film, that doesn't tell you anything. The real test: look at the edge of the sheet. If it's perfectly clear, it's probably extruded. If it has a slightly bluish or yellowish tint, it's probably cast. Or, just ask your supplier. I know that sounds obvious, but I used to just grab the cheapest clear sheet. That was my mistake.

Step 3: The Slate & Stone Prep (Surface Check)

Slate is a fantastic material for the Ortur. It marks beautifully, produces a high-contrast white engraving, and is relatively cheap. But it's not as simple as putting a tile on the bed and hitting go.

I once ordered 50 slate coasters for a wedding. I engraved 10 of them. They looked great. Then I left the stack overnight. The humidity in my garage caused the remaining 40 un-engraved tiles to absorb moisture. The next day, the laser was burning the surface unevenly because the moisture was steaming off. The results were blotchy.

The pre-check:

1. Is it dry? Slate is porous. Store it in a dry environment for 24 hours before engraving. If it's cold or damp, you'll get a weak, uneven mark.
2. Is the surface level? Slate tiles are never perfectly flat. Place a flat piece of wood (like a spoil board) on the bed. Put the slate on that. If it rocks, use a small piece of tape or a leveling pad under the low corners. A rocking tile shifts the focal point, and you get a blurry engraving on one side.
3. Is it sealed? Many slate tiles have a factory-applied wax or sealant. This can smoke and leave a yellow residue. A quick test: wipe a small corner with isopropyl alcohol. If the wipe comes back yellow, you need to clean the whole tile with alcohol first.

This sounds tedious, but it takes 5 minutes per batch of 10 tiles. The failed batch cost me about $60 in materials and a weekend of rework. Not huge in the grand scheme, but frustrating.

Step 4: The Material Thickness & Power Map

This is the step most people ignore. They look at a guide online (even from Ortur), see a setting, and just use it. The problem is that your machine, your environment, and your specific batch of material are unique.

The official Ortur settings for 3mm basswood ply (at least as of December 2024) are a good starting point. But my machine in my garage in January (which is cold and dry) acts differently than a machine in a warm, humid shop in Florida.

My rule (after wasting about $400 in test scrap):

Every time I get a new batch of material—even if it's the same type I used last month—I run a power/speed grid test on a 2x2 inch scrap piece. This takes 15 minutes and saves a lot of ruined work.

• Draw a grid in LightBurn. Rows for speed, columns for power.
• For a 10W diode on the Ortur 3 series, I usually grid test: 200 / 300 / 400 / 500 mm/min at 80% and 100% power.
• For acrylic, I test 3mm, 5mm, and 6mm separately.

The key insight that took me a while to learn: It's not just about power. It's about focus. If your material thickness changes by 1mm, you need to re-adjust the focus. The machine isn't doing it for you. A slightly out-of-focus beam will make a 5mm cut take 3 passes instead of 1, and the edge quality will suffer.

Step 5: The Air Assist & Fumes Check

I didn't use an air assist for my first year. I just thought it was a fancy optional add-on. Then I tried to cut a 5mm piece of acrylic, and the flame (yes, flame) from the cut ignited the dust on the bed. I put it out quickly, but it scared me.

Why air assist isn't optional for these materials:

When you cut wood or acrylic, the laser vaporizes the material. That hot gas is what catches fire. Air assist (a steady stream of compressed air onto the cutting point) blows the hot gas away, preventing ignition. It also clears the smoke for a cleaner cut.

For slate and stone, you don't need air assist for fire prevention, but you absolutely need fume extraction. The dust from engraving stone contains fine particles of silica. You don't want to breathe that in. The smell is distinct—like burnt rock and gunpowder. I run a small extractor out a window. It's non-negotiable for my health.

A quick material fume guide based on my experience:

• Wood (natural): Smells like a campfire. Harmless (unless treated). Air assist recommended.
• Acrylic (cast): Smells like acetone or sharp plastic. Ventilate well. Air assist required for cuts.
• Slate: Smells like burnt rock/dust. Requires ventilation and a mask.
• Leather: Smells like burnt hair. Ventilate. Chromium-tanned leather produces toxic fumes.

A final note on test cuts (and yes, I still screw this up sometimes):
I still catch myself skipping the grid test. I think, "I've cut this material a hundred times, I know the settings." Then the new batch is 0.2mm thicker, or the humidity changed, and I get a bad result. My single greatest cost saver has been the reminder I wrote on the wall next to my Laser Master 2 Pro: "15 minutes of testing saves $150 of waste." I almost never skip it now. Almost.