Is there a way to keep LightBurn from inputing G91 into my g-code output?

[berainlb (PY)]

I’m not really following your assessment of cause and effect. So curious if something else is going on.

@TNTIM1957

Everytime I try to output my g-code for my machine LightBurn will add the G91 command for offsetting the job location instead of my machine absolute position.

Note that entire job is still described in terms of absolute coordinates. The G0 move before the transition to G91 is described in absolute coords. The relatives moves following that are all relative to that starting position so should be in correct absolute position relative to your origin.

@TNTIM1957

It keeps resetting my machine’s “default” G54 position and causing me lots of problems when running other g-code that I have to use daily

I don’t understand how this could be the case. LightBurn switches to G54 work offset but doesn’t change the offset.

@TNTIM1957

I prefer to run all my CNC’s from the machine home position to properly locate my work

This is where what you’re describing seems to not necessarily follow from how it should actually behave. When using Absolute Coords start from mode in LightBurn there should be no issue in running jobs in terms of absolute position from a machine origin.

You haven’t really described the issue you’re having but based on what you’re saying I’m going to guess that you’re not working in positive coordinates.

Take a look here and see if this applies to you:
Common GRBL/GCode Setups - LightBurn Software Documentation

@TNTIM1957

One problem is that LightBurn doesn’t really do the “Z” axis like I need

What do you need and what is LightBurn doing differently from that?