Laser diode modules are mainly used for engraving letters, photos, cut paper and vinyl. I don’t have one but think they top out at 10 watts, but I’m sure anything is possible with $.
For cutting 3-5mm ply or MDF you will need something like a 50 watt CO2 laser. I think 30 watt would struggle. An enclosed laser cutter also solves the problem of capturing the smoke generated from such a cut.
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