Need help for Focal Point

Hello everyone,

I’ve started using my machine with Ruida 90w laser. Just trying a few things around. I’ve tried engraving, it works fine. But when its comes to cutting (3mm plywood) then I’m having some issues. Maybe it’s the focal point? I have a small lens with 12mm diameter. Anyone can tell me what’s the correct focal point that I need to use please?


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