Have you tested youre File on the SD Card and running from the mpcnc itselfs? With my old Notebook the USB Connection failure some Times and the Job aborted. What you can Test ist that you make a Job with estlecam starting the laser manuell and Run the Job, cryptobel phrases and letters in Lightburn were Made when you using a cracked Version from lightburn.
This is a safety feature. Unless the laser is moving marlin will turn off the laser
Which GND did you use?
It sounds like an electrical and/or electrical interference issue to me, we’ll see what some of the others chime in and say as they have more experience with these lasers.
In the meanwhile check that the cables have a good connection
According to a post on this forum, Marlin has the bug fixed. The next time V1 makes a new release of their maintained Marlin firmware, the fix will be incorporated. The laser will then stay on if triggered from a Marlin-driven menu.
My solution (until the bug is fixed) is to manipulate the pin directly, rather than to use Marlin’s laser/spindle commands. See M42 for directly manipulating pins. Another way to get around the bug is to created a script where the laser is turned on, and then the script moves the spindle very slowly for a period of time, and finally turns the laser off.
Another solution is to edit and recompile the firmware so the laser stays on longer when not moving. This is not the best solution for safety reasons, but the line to manipulate is in configuration_adv.h:
I finally got back to the laser today and hooked it up again. It seems that the problem is gone for whatever reason. I changed nothing and it works flawlessly.
Maybe it was some kind of interference although i ruled that out because i rewired it about 3 or 4 times the first time i got the problems.
For the focusing part i used M3 S25 F50 X50 for slow movement and focusing.