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Galvo Focus Gauge
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I made a focus gauge for my fiber laser. You can glue in (2) 5mmx5mm round magnets into the holes so that you can magnetically attach a thin metal business card. For the file, you just have to put a bunch of 20mm lines spaced out. Whatever line is in focus the most is how low you need to lower your galvo head in mm to get it in focus on your surface.
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