3d printable feedstock inks for signal control or computation

A method of forming a signal control backbone apparatus, comprising:

• using a 3D printing operation to print a first ink to form a first material segment which is electrically conductive;
• using the 3D printing operation to print a second ink to form a second material segment contiguous to the first material segment, the second ink including a plurality of electrically responsive chiplets forming a percolating chiplet network in each said second material segment, each said chiplet having a predetermined logic function;
• and
• using the 3D printing operation and the first ink to print a third material segment contiguous to the second material segment such that the first, second and third material segments form a continuous first filament, with the second material segment disposed between the first and third material segments.