How NASA Prints Trees

The title suggests 3D printing of trees, but the article makes it clear that the 3D printing is a means to a more interesting end - to create arrays of cells that then create the desired material.

This will be amazing - imagine not a 3D printer making chips, but a 3D printer making the biological equivalent of a chip fab.

"So you’re not going to take a cow or a sheep or a probably not a silk worm or a tree to Mars."

Even though we'll have 3D printers that generate wood, I still want to plant trees on Mars.