I’d try several different materials for the laser and found out:
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75Gsm A4 white paper, poor (I think the power output was drawn out by the motors when turning to some directions, so the lines at different locations of the pictures were disappeared unevenly)
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Newspaper, better (maybe it is easier to burn in nature XDDD)
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The bottom side of traditional mouse pad, GREAT!!! (Whenever laser turn on, it can always draw lines successfully)
Looking forward for someone to suggest any other materials for embossing/cutting.