Hi everyone, I'm using an Ortur Laser Master 3 with GRBL-HAL firmware version OLLM3ESPROV2.4B. When I send a simple circle design from LightBurn or LaserGRBL, the machine doesn't engrave a proper curve. Instead, it executes a repeated loop of G1 commands

LightBurn Software Questions
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Hi everyone,

I’m using an Ortur Laser Master 3 with GRBL-HAL firmware version OLLM3ESPROV2.4B. When I send a simple circle design from LightBurn or LaserGRBL, the machine doesn’t engrave a proper curve. Instead, it executes a repeated loop of G1 commands like:

G1 X0.000 Y0.164 G1 X0.000 Y0.000 G1 X0.000 Y0.164 G1 X0.000 Y0.000 ...

This results in a vertical oscillation with no X movement — the laser just moves up and down in place. However, when I use the Ortur mobile app (Laser Explorer), the same circle is engraved perfectly.

Here’s what I’ve tried:

  • Reset GRBL with $RST=* and reprogrammed all recommended values
  • Verified $32=1 for laser mode
  • Adjusted $12 (Arc Segment Length) to 0.050
  • Tested $10=0 and $10=1
  • Reduced curve tolerance in LightBurn to 0.1 mm
  • Exported G-code and confirmed it contains only G1 commands with no X progression

Is this a known issue with GRBL-HAL and LightBurn? Could it be related to arc handling (G2/G3), buffer overload, or firmware interpretation of micro-segments?

Any advice or firmware patch recommendation would be greatly appreciated.

Thanks,

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Which options did you use to compile grblHAL? Which mainboard description?

You mean, the laser does what your gcode commands? Then it’s not a firmware issue, but a settings issue. How did you setup your laser in LB?

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