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 t

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.