3D-printed wood can take advantage of the material’s natural tendency to warp as it dries, creating sturdy objects out of initially flat, damp sheets
from other construction. They printed objects from this ink by making layers or adjacent rows of wet strips that warped as they dried.To make a metre-sized bowl, they printed concentric circles of wood ink. From past studies of wood and theoretical models of how wood curves, they knew that wood cells would dry and contract in such a way that the edges of the circle lift up instead of remaining in the shape of a flat circular plate.
Kam says that the amount of warping and the location it occurs in the object can be controlled by the orientation of the 3D printed strips and the speed at which they are printed. This gives two ways to tune the final shape of an object made with the wood ink, says Kam, who presented this research at a meeting of the American Chemical Society in Chicago on 23 August.
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