Super interesting. My only concern is that with traditional braille, it's still printed on paper, and thus easily recycled. If you're creating building and/or city maps that changes regularly... it's not super feasible to keep printing new ones, even if the data is stored digitally and therefore easy to update. Very exciting stuff though.

Just one note: it's possible to "recycle" 3d printed things. You could reduce them to "pellets", and turn the pellets into the PLA spools you started out on. See https://www.3dhubs.com/talk/thread/how-make-your-own-filamen...