You can buy mile long sheets of E Ink material today. I think it is only a couple of dollars per meter. But then you'll need to laminate a backplane of some for

You can buy mile long sheets of E Ink material today. I think it is only a couple of dollars per meter. But then you'll need to laminate a backplane of some form so your printer can print to it. Various barrier layers so that it will last longer than a few minutes in air. It gets tricky real fast.