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Holographic direct sound printing (HDSP) is a method of 3D printing which use acoustic holograms, discovered by researchers at Concordia University.[1][2] Researchers claim that the printing process can be carried out 20 times faster.[3] It also presents the advantages that an object can be created at once and several objects can be created at the same time.[3] It is based on acoustic trapping.[4][5] It can be used to print inside opaque surfaces, for example inside the human body, thus opening new opportunities in medicine.[6][7][8][9]