ednisley
September 20, 2026, 1:40pm
5
As a rule of thumb, if you haven’t changed anything in LightBurn, don’t change anything in LighBurn .
Assuming the PC is connected to the controller with a USB cable, most likely the cable / connectors have worked loose or failed.
A cable with ferrite cores on both ends, bought from a reputable supplier (rather than a randomly named Amazon / eBay seller who also offers beach attire and kitchen utensils), seems to resolve many problems. IMO it’s because the ferrite cores justify a price high enough to allow better (or any) QC for the internal wiring.
Some previous discussions:
WOO HOO !!! I got everything working right , FINELY !!! What was the problem?
It turns out to be the USB to Controller board cable was faulty. That was the only thing I failed to check and that was it. I have a bad habit of buying one to use and one to loose.
When I thought about the cable being bad, I got the cable out the spare controller kit and that one worked. I feel really stupid sitting here thinking how I spent 4 to 6 weeks crying and trying to fix this thing and never though…
Thank you Mike for all the help, that was the problem, I replaced the USB cable with a new one and it took care of my problem.
Thank you,
John J
However, if it’s a Ruida controller, using Ethernet will eliminate all USB problems.
Some previous discussions cover the situation:
Hi everyone,
I’m having a strange issue with my laser cutter and I’d love some help figuring it out.
As you can see in the picture (from top to bottom, it shows my first to most recent attempts), some letters are randomly missing or partially cut when engraving text. I’m cutting at speed 50mm/s and power 35%.
I’ve already tried applying an offset, and then used the Pathfinder tool (unite/merge) afterward — but there’s always a small issue somewhere.
What’s odd is that if I cut each letter in…
Hello. I’m new to the forum but have been using my OMTech 70W Co2 laser for a couple years. I’m wondering if anyone else has had an issue with the laser stopping after a few seconds. I was running a batch of stuff and as soon as I changed files, Lightburn said it needed to be updated (to version 2.0.02). I did the update and that was it. Every time I try to engrave, it stops after a few seconds. Nothing else changed except for the update. I’ve reinstalled old versions, rebooted everything, and n…
I am operating macOS Sequoia 15.5 on Apple M1 system. After installing v2.0.00 and trying to cut
the laser will jump and cut a line that does not exist on the workspace? I tried multiple times to cut different images and the same occurs each time. I did the update and the same issue.
I have reverted back to 1.7.08 and no issues. Any suggestions would be appreciated,
[IMG_8505]
I managed to get the machine to talk to the network again by issuing a static IP to it from my firewall and matching that IP in the controller.
Now that its communicating over ethernet, the overwrite error no longer occurs. So it seems that particular issue is usb related.
Can you please mark this one as resolved.
I guess the underlying cause of what happened was down to old firmware on the machine conflicting with something in LB2.1.01.
Since updating to LB 2.1.02 and updating the firmware,…
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