Setting laser height

I am having trouble setting my laser height. Takes hours to get it to burn. Once set it is fine Then is trial and error again. There has to be something I am missing. Laser is Sain Smart 3018 Pro

Thank You

Vernon CooperSain

I’m gonna guess a diode laser??? Focus to the smallest dot possible on black construction paper. mark a small piece of mdf with the height and use it like a story stick

yes a diode laser

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