Recently put my 10W back on and had to dial it in with the new square I use for repeatable origins. Accidentally ran a fill instead of just a score and… huh, the edges were massively blurry kinda like my offsets were absolutely horrible. Some more testing and I figured out, the laser isn’t actually turning off during the overscan sections! Something in the background changed on the firmware. If you’ve been dealing with fuzzy/blurry edges, this might be your fix as well.
Here’s an image from testing (one square goes in the opposite direction because I rotated the stock).
Notice on the red dot one, all the lines go outside the box, no matter the offset, they look fairly even too! So I made a massive offset and changed the setting “Use G0 moves for overscan” as seen below. I also added the below code to the start gcode box.
G0 S0
G1 S0
Since Marlin saves the power for G0 and G1 separately, if there’s a different value it can just run as well, as Lightburn expects any G0 line to be off (like every other laser does). Those two lines ensure they’re set to 0 power.
This gave me green dot square, success! So I put my offset back to where it was, obtained blue dot square. Perfection.
So yeah, TL;DR, enable Use G0 moves for overscan and put the two lines above in your start, and end gcode (just for safety on the end).