Beginner here. Can I use Lightburn on 1 laptop, and run 2 different files at the same time to 2 different Ottur lm3 engravers via USB cables?
It is possible. You have to start LightBurn in 2 sessions individually and configure/run your project. You can switch back and forth between the two sessions like with other programs.
However, USB connections are sometimes a bit “special” but once the computer has first assigned addresses to the USB for both lasers it should work.
If I personally had to run mass production on 2 lasers I wouldn’t do it, but it’s more the concept itself that I’m not so keen on.
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If using a hub, you may encounter a situation where Windows sees both of the lasers as the same device. Ideal is by using separate USB ports on the PC, but some users have reported (without details) using a hub and it worked. Experiment. Open Lightburn, then open a New Window. You will see 2 instances of Lightburn on the Taskbar.