From my own perspective, the interesting part of the carbon3D thing was that apparently the real money was in dental and orthodontics - an area a lot of venture and 3D printing probably does not delve into all that often.
Admittedly, there's apparently an industry I had never looked at that's actually kind of interesting, with metal and resin printed dentures. [1]
Such as, the first company on that list, which I never read about on Tom's or Ars or other 3D printing sites, Zortrax [2], apparently makes a semi-cheap printer that does bioresin (can you get that for home use? RepRap bioresin spools?) for $2k. $2k seems cheap compared to the carbon3D ones, they're apparently $50k-100k. Could reasonably print my own dentures for $2k.
[1] https://all3dp.com/1/dental-3d-printing-a-guide-for-professi...