The xPRO board will stay on the Sphinx. On the rolling plotter, I am using a MKS Gen V1.4 board with 12v PS running Klipper firmware. I would have used Marlin on it, but could not get the servo Z axis to work the way I wanted it to. For Servo M280 gcode commands in Marlin it sends them immediately instead of waiting for G1 or G0 x/y movements to finish. Klipper lets me define a macro to redefine a gcode command in my case I changed G11/G10 which is normally Filament Recover/Retract to Pen Up/Pen Down movement which makes the machine use it in correct sequence. I got the G11/G10 idea from some source on the internet that I don’t recall at the moment. If I decide to use a normal Z-axis motor for this instead of a servo motor that problem can go away. I have a spare arduino uno with CNC hat and also the keystudio board. I was going to use one of those boards on the Eggbot, but put that project aside when I started the Rolling Plotter idea. Actually I started the Rolling Plotter idea while waiting on parts for the Eggbot. If I use the laser, sounds like grbl is the better way to go. I doubt I will get a laser anytime soon unless I really get bitten by the laser bug. I would like to gather as much info now to help make an informed purchase later.
I might get the glasses sooner in case my neighbor needs some help with his laser engraver. He has zero experience with these, but is doing well with it so far. His engraver came with benbox. I told him about lightburn you mentioned and some other free sources. He seems mostly interested in using it to burn an image of his signature logo in wood products he makes. I mentioned to him that a vector image would be a lot quicker to burn.
I also bought a wood burning tool last year from Sam’s Club & a router speed control from Harborfreight. I really should test that since I have it on hand, before getting a laser. No glasses needed either.