"In the past year, Rael began expanding the printing materials to include salt and wood. The wood is sawdust from maple, pine and pecan trees used in the lumber industry. The 3D-printing process used by Rael's team is different than the "extrusion" process used by competing approaches."

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See also: http://gizmodo.com/renewable-recyclable-3d-printing-with-wood-and-salt-486558507
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