Method for manufacturing an auxiliary device suitable for the manufacture of a patient customized implant comprising the steps of: 1) obtaining 3D image data, preferably a CT of a defect site of a patient's anatomy (1)； 2) generating a computer model of the defect site based on the 3D image data and 3D generic reference data by using image processing techniques； 3) virtually reconstructing the defect site； 4) generating a computer template (30) which represents an auxiliary device (40) that is suitable for sizing, shaping and positioning of alloplastic implants； and 5) manufacturing an auxiliary device (40) using 3D printing. Furthermore, there is provided a method for manufacturing a patient customized implant using the auxiliary device and a method for the reconstruction of a particular anatomy by using the manufactured patient customized implant.
