[AlecS]

I've used their laser cutters for a few things, I wouldn't suggest using them for transmission plates. I haven't tried any decent tolerance parts on it, but from visual inspection of other 1/4" things I've done, taper is gonna be a issue. Also the kerf does not always appear to be constant, as at the speeds slow enough to cut 1/4" delrin, heat will build up in non consistent ways. Overall I think your going to have pretty big issues cutting transmission plates with reasonable tolerances. I'd suggest just using their router instead, as that should give you no issues holding tolerances. Good Luck

EDIT: Also you can't cut polycarbonate on those laser cutters, as they do not have adequate filtration to handle the toxic gases they create.