The video presents a cable driven 3D-Printer, based on the parallel kinematic delta plattform. The machine uses dyneema fishing line as cables and a custom kinematic model running on the 'smoothieboard' printer board.
Carbon fiber preloading rods are used to keep the cables under tension, providing the necessary stiffness and allowing for rapid accelartion.
The parallel kinematic design has potential benefits for large workspaces.