He wants to team with legendary geneticist Craig Venter to print life on the Red Planet.

Printing life is not something that's going to be done tomorrow, but, as we've covered before, it's not a line of thinking that's totally unprecedented or outside the realm of possibility. Some of NASA's very best scientists believe that in order to colonize other planets, we'll need to encode the human genome into bacteria, send those bacteria into space, and reassemble the genomic data they carry once they finally land on another planet.

This is a school of thought that Musk also subscribes to, which is notable, because Musk is, at the moment, the single human most likely to enable our colonization of other planets.

Musk doesn't want to print humans, per se. Instead, he wants to print bacteria and other organisms that will eventually help us terraform Mars using a "digital biological converter" developed by Venter that can take take raw DNA code, implant it into a "universal recipient cell," and bring it to life.