Abstract: Examples provide computer-implemented methods for forming a fiber-reinforced composite device comprising fiber-comprising tows. Methods include forming a first preform model having one or more anisotropic tow layup portions comprising fiber-comprising tows; receiving one or more mold geometrical components; receiving one or more molding force vector parameters; forming a n intermediate device model by deforming the first preform model against the mold geometrical components using the molding force vector parameters; and forming a second preform model. Forming the second preform model includes adjusting the first preform model by forming a tow layup adjustment vector comprising one or more vectors extending from one or more tow of the fist preform model to one of more tow of the second preform model as a function of one or more position transformation vectors extending from one or more tow of the first preform model to one or more tow of the intermediate device model.