1. A method for printing a three-dimensional part with an additive manufacturing system, the method comprising: providing a digital model of the three-dimensional part to a computer-based system; generating strain data from the digital model with the computer-based system, wherein generating the strain data comprises generating strain tensors for a plurality of voxels of the digital model; determining a dominant tensile strain direction for the digital model from the strain data with the computer-based system; selecting an orientation for the digital model in a coordinate system based at least in part on the determined dominant tensile strain direction; and generating printing instructions from the oriented digital model with the computer-based system.