Stitching by inserting curable compliant materials of parts produced via additive manufacturing techniques for improved mechanical properties

A 3D printed object comprising:

• a channel comprising cured material, wherein the channel comprises two or more channel parts, each channel part having a channel axis, and two or more channel axes having a mutual angle greater than 0° and less than 180°, wherein the cured material has a lower stiffness than 3D printed material surrounding the cured material, wherein the channel further comprises an anchoring part having at least one of a bifurcation structure or a stitch structure, wherein the 3D printed object comprises two or more layers, and wherein the channel runs through a first layer of the two or more layers and through a second layer of the two or more layers, wherein the first layer is overlayed vertically on top of the second layer during 3D printing of said 3D printed object.