So do we over at Additively (your post made me signup after just reading HN for a while). We publish showcases such as the commercial application of the posted aligners on our site - more curated showcases will be published soon.
https://www.additively.com/en/showcase
Edit: That's the commercial 3d printing use case mentioned (Invisalign isn't the only one):
https://www.additively.com/en/showcase/en/steiner-werkzeugma...