An apparatus and manufacturing method for a reinforced fill-compositing prosthetic device. A prosthetic device is manufactured according to an additive manufacturing method. The prosthetic device is manufactured with a multitude of internal channels running in one or more linear or angular paths relative to a calculated sheer force direction, which may follow the contours of the prosthetic device. Channels defining an internal structure of a socket wall are open on at least one end of the prosthetic device. One or more structural inserts comprising a strength tested tensile strength material, such as carbon fiber, are inserted into the channels and bonded into place.
