I'm pretty sure that's how they're doing it. Just rendering up the STL out of pre-rendered/sculpted parts, and then printing it via SLS or something. Heck, they probably even do lost PLA for printing the metal bits.

This isn't to say that their tech stack isn't fucking cool, I just know enough about the technologies involved that it's a well executed magic trick, and not, you know, MAGIC!
--
-Pasha (Who's still building his dual-pistol wielding dwarven battle nun)
"Don't change the subject"
"Too slow, already did."