1. A method for creating personalized objects having at least one mechanically functional portion, the method comprising at least one step of editing a three-dimensional model using a computer program and a step of transforming the model into a physical object using a rapid prototyping machine, wherein during the editing step: a computer program processes a deformation of the original model into a deformed model, a three-dimensional geometrical constraints database, associated with said models, provides a set of constraints on the geometry of said mechanically functional portions, and a computer program computes at least one step of comparison between geometrical constraints from said database and a model selected between the original model and the deformed model.