Not Poster, but commercially-available solid state lasers top out at a few tens of watts and due to limited wavelengths have restricted usage on certain materials (eg. even different colours of the same type of plastic may or may not cut, well or at all). I know I've a machine in mind that would be great to make if the available diode lasers were able to cut a wider range of materials, never mind metals.

If it can cut metal, it'd probably not suffer much in the way of limitations on other materials... .