Not a specific answer because I don't know, but for your DD use Sandia, Optomec and LENS, just to point you in a direction for more info, general. I did post something a long time ago about something Sigma and Sandia, a brochure of Sandias that maybe showed how they influenced local business development.
here, post #30536
sigma-labs-optomec-tap-into-3-d.html
post # 3368
I was disappointed when I saw these projects go to DDD, and when I saw that the USAF research working with someone else because Sigma had a thing with them once too.