Actual measurements do not match Height and Width on screen

2" x 4" in Lightburn comes out as 2-3/8" x 4-3/4". How can I fix this?

have you checked the axis calibration. what controller are you using?

The Troubleshooter points to common causes:

However, a CO₂ laser with a Ruida controller typically has good axis calibrations.

Does the layer have a rather large Offset in effect, perhaps inadvertently?

Telling us a bit more about what’s going on will help:

  • Is this a new machine, new to you, or a homebrew?
  • Did it ever work correctly?
  • Is the mismatch on a Line layer or a Fill layer?

Uploading the offending lbrn2 file will let us take a look at the settings and perhaps uncover other issues.

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