A system for additively manufacturing an object, the system comprising: a fiber supply, configured to dispense elongate fibers; a resin supply, configured to apply a resin to the elongate fibers, dispensed from the fiber supply, to create a feedstock line, comprising the elongate fibers at least partially encapsulated in the resin, which is in a first non-rigid uncured state; a rigidizing mechanism to receive the feedstock line with the resin in the first non-rigid uncured state, wherein the rigidizing mechanism is configured to transform the resin of the feedstock line from the first non-rigid uncured state to a rigid uncured state, and wherein the feedstock line and the resin are more rigid when the resin is in the rigid uncured state than when the resin is in the first non-rigid uncured state; a delivery guide to receive the feedstock line from the rigidizing mechanism with the resin in the rigid uncured state, wherein the delivery guide is configured to deposit the feedstock line along a print path; a feed mechanism, configured to feed the feedstock line through the delivery guide; a de-rigidizing mechanism, configured to transform the resin of the feedstock line, as the feedstock line passes through the delivery guide or as the feedstock line exits the delivery guide, from the rigid uncured state to a second non-rigid uncured state, so that, before the feedstock line is deposited along the print path by the delivery guide, the resin of the feedstock line, exiting the delivery guide, is in the second non-rigid uncured state, wherein the feedstock line and the resin are less rigid when the resin is in the second non-rigid uncured state than when the resin is in the rigid uncured state; and a curing mechanism, configured to transform the resin of the feedstock line, deposited by the delivery guide along the print path, from the second non-rigid uncured state to an at least partially cured state. a fiber supply, configured to dispense elongate fibers; a resin supply, configured to apply a resin to the elongate fibers, dispensed from the fiber supply, to create a feedstock line, comprising the elongate fibers at least partially encapsulated in the resin, which is in a first non-rigid uncured state; a rigidizing mechanism to receive the feedstock line with the resin in the first non-rigid uncured state, wherein the rigidizing mechanism is configured to transform the resin of the feedstock line from the first non-rigid uncured state to a rigid uncured state, and wherein the feedstock line and the resin are more rigid when the resin is in the rigid uncured state than when the resin is in the first non-rigid uncured state; a delivery guide to receive the feedstock line from the rigidizing mechanism with the resin in the rigid uncured state, wherein the delivery guide is configured to deposit the feedstock line along a print path; a feed mechanism, configured to feed the feedstock line through the delivery guide; a de-rigidizing mechanism, configured to transform the resin of the feedstock line, as the feedstock line passes through the delivery guide or as the feedstock line exits the delivery guide, from the rigid uncured state to a second non-rigid uncured state, so that, before the feedstock line is deposited along the print path by the delivery guide, the resin of the feedstock line, exiting the delivery guide, is in the second non-rigid uncured state, wherein the feedstock line and the resin are less rigid when the resin is in the second non-rigid uncured state than when the resin is in the rigid uncured state; and a curing mechanism, configured to transform the resin of the feedstock line, deposited by the delivery guide along the print path, from the second non-rigid uncured state to an at least partially cured state.