1 verified settings · manufacturer data · diode laser · Updated January 2026
| Operation | Speed (mm/s) | Power (%) | Passes | Air Assist | Notes |
|---|---|---|---|---|---|
| engrave | 333.33 | 35% | 1 | — | LightBurn Grayscale image mode. LaserGRBL S350, 8L/mm |
The Ortur LU3-20A/B cuts A4 Paper cleanly at 333.33 mm/s with 35% power. Always test on a scrap piece first — every machine is slightly different, and variables like tube age, lens condition, and material batch can shift results.
For A4 Paper, the key variables to dial in are speed and power. If the laser isn't cutting through cleanly, slow down or add a pass before pushing power higher — excessive power causes charring and wider kerfs. Air assist is highly recommended for wood and organic materials to clear smoke and protect the lens.
Once you find settings that work, save them in Laser Lab to build your personal settings library. The AI predictor uses your calibrated results to suggest starting points for new materials automatically — so the more you log, the smarter it gets.
For cutting A4 Paper on the Ortur LU3-20A/B, start at 333.33 mm/s speed and 35% power. These are manufacturer-verified starting points — always test on scrap first.
Air assist is strongly recommended when cutting A4 Paper. It clears smoke from the cut path, reduces charring, and helps protect your laser lens.
The manufacturer recommends 1 pass to cut through A4 Paper at 333.33 mm/s and 35% power. If the cut isn't clean, try reducing speed slightly before adding more passes.
Incomplete cuts are usually caused by incorrect power, speed, or focus distance. If edges are charred, try increasing speed or reducing power. If the laser isn't cutting through, reduce speed or increase power — or add an extra pass. Also verify your focal distance is correct for the material thickness and that your lens is clean.
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