A system for additively manufacturing an object, the system comprising: a source of a feedstock line, wherein the feedstock line, originating from the source, comprises elongate fibers, at least partially encapsulated in a resin in a first at least partially uncured state; a rigidizing mechanism to receive the feedstock line from the source with the resin of the feedstock line in the first at least partially uncured state, wherein the rigidizing mechanism is configured to transform the resin of the feedstock line from the first at least partially uncured state to a rigid at least partially uncured state, and wherein the feedstock line and the resin are more rigid when the resin is in the rigid at least partially uncured state than when the resin is in the first at least partially uncured state; a delivery guide to receive the feedstock line from the rigidizing mechanism with the resin in the rigid at least partially 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 at least partially uncured state to a second at least partially 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 at least partially uncured state, wherein the feedstock line and the resin are less rigid when the resin is in the second at least partially uncured state than when the resin is in the rigid at least partially 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 at least partially uncured state to an at least partially cured state. a source of a feedstock line, wherein the feedstock line, originating from the source, comprises elongate fibers, at least partially encapsulated in a resin in a first at least partially uncured state; a rigidizing mechanism to receive the feedstock line from the source with the resin of the feedstock line in the first at least partially uncured state, wherein the rigidizing mechanism is configured to transform the resin of the feedstock line from the first at least partially uncured state to a rigid at least partially uncured state, and wherein the feedstock line and the resin are more rigid when the resin is in the rigid at least partially uncured state than when the resin is in the first at least partially uncured state; a delivery guide to receive the feedstock line from the rigidizing mechanism with the resin in the rigid at least partially 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 at least partially uncured state to a second at least partially 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 at least partially uncured state, wherein the feedstock line and the resin are less rigid when the resin is in the second at least partially uncured state than when the resin is in the rigid at least partially 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 at least partially uncured state to an at least partially cured state.