A system for additively manufacturing a composite part, the system comprising: a delivery assembly, wherein: the delivery assembly comprises a delivery guide movable relative to a surface and configured to deposit at least a segment of a continuous flexible line along a print path, wherein the print path is stationary relative to the surface, the delivery assembly further comprises a first inlet, configured to receive a non-resin component, and a second inlet, configured to receive a photopolymer resin, and the delivery assembly is configured to apply the photopolymer resin to the non-resin component; a feed mechanism, configured to push the continuous flexible line, comprising the non-resin component and further comprising a photopolymer-resin component that comprises at least some of the photopolymer resin applied to the non-resin component by the delivery assembly, out of the delivery guide; and a source of a curing energy, wherein the source is configured to deliver the curing energy at least to a portion of the segment of the continuous flexible line after the segment of the continuous flexible line exits the delivery guide; and wherein: the delivery assembly further comprises an upstream portion opposite the delivery guide relative to the feed mechanism, the feed mechanism is configured to push the continuous flexible line through the delivery guide and pull the continuous flexible line through the upstream portion, the upstream portion facilitating application of the photopolymer resin to the non-resin component upstream of the feed mechanism, downstream of which is positioned the delivery guide, the upstream portion comprises the second inlet, an upstream outlet, through which the continuous flexible line exits the upstream portion, and an upstream line passage extending from the first inlet to the upstream outlet, and the second inlet of the upstream portion is in fluid communication with the upstream line passage. a delivery assembly, wherein: the delivery assembly comprises a delivery guide movable relative to a surface and configured to deposit at least a segment of a continuous flexible line along a print path, wherein the print path is stationary relative to the surface, the delivery assembly further comprises a first inlet, configured to receive a non-resin component, and a second inlet, configured to receive a photopolymer resin, and the delivery assembly is configured to apply the photopolymer resin to the non-resin component; the delivery assembly comprises a delivery guide movable relative to a surface and configured to deposit at least a segment of a continuous flexible line along a print path, wherein the print path is stationary relative to the surface, the delivery assembly further comprises a first inlet, configured to receive a non-resin component, and a second inlet, configured to receive a photopolymer resin, and the delivery assembly is configured to apply the photopolymer resin to the non-resin component; a feed mechanism, configured to push the continuous flexible line, comprising the non-resin component and further comprising a photopolymer-resin component that comprises at least some of the photopolymer resin applied to the non-resin component by the delivery assembly, out of the delivery guide; and a source of a curing energy, wherein the source is configured to deliver the curing energy at least to a portion of the segment of the continuous flexible line after the segment of the continuous flexible line exits the delivery guide; and wherein: the delivery assembly further comprises an upstream portion opposite the delivery guide relative to the feed mechanism, the feed mechanism is configured to push the continuous flexible line through the delivery guide and pull the continuous flexible line through the upstream portion, the upstream portion facilitating application of the photopolymer resin to the non-resin component upstream of the feed mechanism, downstream of which is positioned the delivery guide, the upstream portion comprises the second inlet, an upstream outlet, through which the continuous flexible line exits the upstream portion, and an upstream line passage extending from the first inlet to the upstream outlet, and the second inlet of the upstream portion is in fluid communication with the upstream line passage. the delivery assembly further comprises an upstream portion opposite the delivery guide relative to the feed mechanism, the feed mechanism is configured to push the continuous flexible line through the delivery guide and pull the continuous flexible line through the upstream portion, the upstream portion facilitating application of the photopolymer resin to the non-resin component upstream of the feed mechanism, downstream of which is positioned the delivery guide, the upstream portion comprises the second inlet, an upstream outlet, through which the continuous flexible line exits the upstream portion, and an upstream line passage extending from the first inlet to the upstream outlet, and the second inlet of the upstream portion is in fluid communication with the upstream line passage.