> All of the lithography machines have the same setup inside because only one company makes them (ASML). I've definitely read papers where universities fiddle

> All of the lithography machines have the same setup inside because only one company makes them (ASML). I've definitely read papers where universities fiddle with the internals of ASML machines, including the optics, to try out different things. I'd imagine R&D departments at Intel, Nvidia, etc. probably do the same, but I'm no expert.