Some people are trying to «printing all of Wikipedia onto 6-inch nickel discs [...] 270 discs, each about 1mm thick». https://en.wikipedia.org/w/index.php?title=Wikipedia:Village_pump_%28technical%29&oldid=523529852#Nanoscale_printing_of_Wikipedia They "only" need all the articles in raster image format, they say. I think their safest bet would be to take an HTML/ZIM dump and then use one of the many tools like http://khtml2png.sourceforge.net/ to get a PNG or other image format, but it would be nice if some of you could give some better informed advice.
Nemo