I don't think so, but corrections are welcome. It's also mentioned in another comment and (I think) the video about how it wouldn't work in chocolate. As it wo

I don't think so, but corrections are welcome. It's also mentioned in another comment and (I think) the video about how it wouldn't work in chocolate. As it works creating oxide layers, not a diffraction structure: If you try it directly on PMMA it won't create a diffraction structure, but a kinda slightly melted surface. I don't know if etching would be possible with enough precision on PMMA. If you do it on steel and use it as a mold to pour (?) PMMA, as people do with chocolate and diffraction grates on plastic, there's no structure to transfer.