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even small 40W lasers can do 3mm thick plywood. A 100W laser can do up to 6-9mm and 280W power can do 18mm thick ply.
I cut shapes out of 16mm thick MDF every day and out of 18mm thick MDF a few times a week.
I have also tried to cut through steel and it cuts through too. However a manufacturer told me that this model has not been designed for cutting metals and they explained it as the beam reflected from metal can damage either mirrors or tubes. So I do not think I will be doing metals.
It can cuts through acrylic too, 25mm thick should not be a problem for 280W power.
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