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Focusing problem? Answered

I don't have any Focus Gauge. Can you tell me what should be the perfect distance between laser head and material.


That's going to depend on your machine. It's a function of the shape of the lens and the distance from the lens to the core. If you're using a DIY machine or a machine that doesn't have a focus gauge, here's a great tutorial on how to test your machine to figure out what your focal length is: https://www.youtube.com/watch?v=Eg6THrEdleo