1. A computer-implemented method of manufacturing 3D objects, including: a) retrieving a source model for a 3D object and a plurality of defined control points for the 3D object from a database; b) receiving modifications to at least some of the control points from a first user; c) automatically applying the modifications to the source model to create a modified model; and d) automatically generating print instructions for manufacture of a customised version of the 3D object.