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Holographic direct sound printing (HDSP) is a method of 3D printing which use acoustic holograms, developed by researchers at Concordia University.[1][2][3] Researchers claim that the printing process can be carried out 20 times faster[4] and that it presents the advantages that an object can be created at once and several objects can be created at the same time.[4] According to researchers, it can be used to print inside opaque surfaces, for example inside the human body, thus opening new opportunities in medicine.[5][6][7][8] It is based on Direct Sound Printing method, introduced in 2022.[9][10][11] A similar method, to print 3D objects using ultrasound holograms, based on acoustic trapping,[12][13] was proposed by researchers at the Max Planck Institute for Medical Research and Heidelberg University, in February 2023.[14][15][16]