grbl VS cncjs

The other thing to consider is the $12 config in GRBL itself: Arc tolerance. Drawing circles is EITHER a long series of small line segments, OR an "arc". If this problem only effects arcs: you can likely limit your search there.

You can use NO limit switches with GRBL. Here is some info. But NC is generally a better option because if there is a failure in a wire or connector, the circuit will open and stop the machine.

Grbl is a firmware for Arduino based microcontroller dev boards. https://github.com/gnea/grbl/wiki Once programmed you stream the gcode to the grbl controller over USB. It's constrained by the limitations of the Arduino hardware or runs on but it's a great entry point to CNC machines. Note that a 32 bit grbl is under development but pre built control boards are still rare.

The gnea/grbl GitHub Getting Started page spells all that out.

This may not be a fit, but it may give you ideas for prototyping/software dev. I have prototyped various CNC/optical/medical projects using GRBL GitHub and a simple benchtop frame-gantry setup that I made from 80/20 and steppers.

To learn more: https://github.com/gnea/grbl/wiki/Grbl-v1.1-Configuration

If it really is GRBL, you'll find most of the information you need at https://github.com/gnea/grbl/wiki and the $ commands at https://github.com/gnea/grbl/wiki/Grbl-v1.1-Commands

I believe the Tool Change command is supported by: gSender or cncjs.

Get a raspberry pi, https://www.raspberrypi.org/, throw UGS https://winder.github.io/ugs_website/ or cnc.js https://cnc.js.org/ on it.

I use https://cnc.js.org/ to send g-code to the machine, this uses web page interface to set up the machine.

https://github.com/cncjs/cncjs/issues/431 ?

CNCjs - For CNC, same as above but for my CNC router, though I would never trust my CNC to run when I'm not physically close by ha ha so this hasn't been exposed to my OpenZiti network.

I think cncjs is what you're looking for: https://cnc.js.org/

Can you try with a different gcode sender software (cncjs), to see if you can Reset (red button) and Unlock (orange button)?

6 - Alternative, Save the gcode and use a g-code sender (example: cncjs). Notice: a g-code sender needs to know where is the 0,0 position/the start position, so in LightBurn select the start position "Current Position" and select the appropriate Job Origin. Save the gcode. On cncjs, move the laser to the "Job Origin" and zero both X and Y (the icon after the + on the Work Position). Click the blue Upload G-Code button, select your file and press the Play button to start the job.

Software: bCNC, cncjs, a couple others