1. An apparatus for additively manufacturing an object from a thermoplastic material having dimensions, comprising: an extruder configured to move, with respect to the object while depositing the thermoplastic material, wherein the deposited thermoplastic material exhibits an anisotropic tensile strength along an axis of a direction of deposition, and a pattern of the depositing is selected to deposit the thermoplastic material in the object according to, in a stress analysis of a predetermined object model of the object, different tensile loads directed along axes of the object, according to an array of predetermined 3D tensile stresses of the predetermined object model of the object under stress, while substantially maintaining the same dimensions of the object as configured for manufacture.