Hello.
I’m new user of LB with a laser on a printer with Duet 3D motherboard.
No problem in cut mode but when I’m trying to generate a gcode in image mode the positions are relatives and not absolutes. I don’t know why and how change this setting.
Can you help me ?
Have a read of this and let us know if I am not understanding you.
https://lightburnsoftware.github.io/NewDocs/CoordinatesOrigin.html
Sorry for my english, I’m french. I’ve already read this page. It’s OK in cut mode. But
The issue is that in image mode only.
The worst is that was OK at the beginning. But even reinstalling LB, it doesn’t work.
Here’s my gcodes without change of setting.
For an image :
G90
; Image @ 40 mm/sec, 100% power
M9
M5
G0X339.9Y313.65
G0Z13.9
; Layer C00
G91
M3
G1X5.8F2400S255
G1Y0.1S0
G1X-5.8S255
G1X-0.2Y0.1S0
G1X6S255
G1X1.3Y0.1S0
G1X-8.4S255
For lines :
G90
; Cut @ 5 mm/sec, 100% power
M8
M5
G0X327Y322.07
G0Z0
; Layer C00
M3
G1X326.07Y322.51S255F300
G1X325.2Y322.95
G1X324.4Y323.38
G1X324.03Y323.58
G1X323.68Y323.79
G1X323.36Y323.98
G1X323.06Y324.17
G1X322.8Y324.35
G1X322.56Y324.53
G1X322.35Y324.69
G1X322.18Y324.84
There is no way at present to have LightBurn generate raster engraving code using absolute coordinates. Relative moves are significantly shorter in practice, so it reduces the transmission bandwidth (and the time it takes to generate the output).
Why do you need gcode with absolute positioning?
Thanks for your answer.
So I’m waiting for Lightburn generate absolute code 
I need absolute positionning because Duet3D boards run in this mode by default.
We can change in the file by G90 and G91 but it causes problems (coordinates outside of limits) when I’m mapping axis (IDEX printer with laser on U axis mapped on X in laser mode)
I’m searching a solution and I’m posting here if I found.
I’ve found. It was enough to write a G90 in the start code because my positioning of axis (park of X and centering of U) are in absolute coordinates.
Then Lighburn write G91 and no problem.
It’s mean RRF turns relative mode when selecting laser mode.
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