Kind of annoying that threads get locked automatically with no real answers. I want to say I have the same issue as this thread.
I run some text, then I run images with a z offset of -0.0394 to defocus.
Text runs, then z offset is adjusted and the First image is fine. The bed then seems to reset and offests again, but the second image runs much slower and power output seems affected in a weird way,. Display still shows expected speeds.
If I set the z offset to zero, no other changes, all 10 images run just fine.
Looking at a few decoded files with different numbers of images and z moves: At the start of the file it’ll do the first z move, then set the layer speed for the image. However subsequent z moves will set a speed for the z axis move and then it does not have another speed command.
I think what is happening is that even though the speed for the layer has been set, the speed for the z move is overriding it, and its not being set back to the layers speed.
However, when turning on “Optimize Z moves”, the RD file does not have any z move or speed commands between the images. So this setting may actually fix the issue.
This does seem like a possible bug in lightburn, that even if the Optimize Z moves does fix it, the non optimized one should still work as expected.