The present invention relates to a method for manufacturing an implantable prosthesis, in other words, a biomodel, which can be implanted in a patient, preferably in the cranium of a patient, wherein the method is based on the use of commercially available adhesive tape, in order to reduce the manufacturing costs of said implant since there is no need to heat same to very high temperatures in order to mould the material to be implanted. The implant is preferably made of titanium via a cold-production process, which requires initially supplying a rapid prototype from a CAD model that corresponds to a plastic mould, which is covered with commercially available adhesive tape, in order to obtain another model that makes it possible to form the model that will be transferred to titanium, thus reducing the ideal temperature for moulding same.