Skip to content

1.8 OpenBurn Laser Setup and First Engraving

OpenBurn Laser is a free laser engraving and cutting software for Windows, developed by M3D-FORMATION.
It is a free alternative to LightBurn with a similar, intuitive interface, and works with all GRBL-based machines such as the YUMI Laser (L-A4 / L-A3 / L-A2).

OpenBurn Laser Logo

Main features:

  • Compatible with GRBL / Arduino-based laser machines
  • JPEG / PNG image import and resizing
  • Vector drawing tools: rectangles, circles, lines, hexagons, and text
  • Multiple machine profiles
  • Frame function to preview the engraving area before starting
  • Automatic updates

1.8.1 - Install OpenBurn Laser

  • Download OpenBurn Laser for free from the official website: https://www.m3d-formation.com/openburn/
  • Run the installer (OpenBurn_Laser_Setup.exe) on your Windows computer (OpenBurn Laser is Windows-only).
  • The software checks automatically for new versions at startup.

1.8.2 - Connect Your YUMI Laser

  • Power on your YUMI Laser.
  • Connect it to your computer via USB cable.
  • Wait for Windows to recognize the device.
  • In OpenBurn Laser, select the correct COM port and connect (baud rate: 115200).

1.8.3 - Create a Machine Profile for Your Model

OpenBurn Laser supports multiple machine profiles, so you can save one profile per machine or laser module.

  • Create a new profile and enter the work area dimensions for your model:
Model Width (mm) Height (mm)
L-A4 210 297
L-A3 420 297
L-A2 420 594
  • Give the profile a clear name, e.g. YUMI-LA4-2.5W.

1.8.4 - Import or Create a Design

  • Import a JPEG or PNG image to engrave, and resize it as needed.
  • Or create a design directly with the built-in drawing tools: rectangles, circles, lines, hexagons, and text.
  • Place the design inside the workspace area.

1.8.5 - Set Laser Power

  • Laser power is expressed as a percentage of the maximum PWM value.
  • Recommended starting values:
  • 2.5W → 10–40%
  • 5.5W → 20–70%
  • 10W → 30–90%
  • 20W → 50–100%

Always start low and increase gradually to avoid burning materials.

1.8.6 - Position & Focus the Laser

  • Move the laser head manually over the workpiece.
  • Place the 5 mm spacer on the surface.

Laser Focus Spacer

  • Loosen the fixing screws of the laser module.

Laser Module Screws

  • Slide the laser down until it touches the spacer.
  • Remove the spacer and tighten the screws.

Laser Focus Adjustment

1.8.7 - Frame the Engraving Area

  • Use the Frame function: the laser head traces the outline of your design at low power, so you can check the positioning without marking the material.
  • Adjust the material position and repeat the frame until the alignment is correct.

1.8.8 - Start Engraving

  • Verify speed, power, and focus.
  • Click Start to begin engraving.
  • Stay near the machine and monitor the process for safety.