is defined by a physical track that the parts are pulled through the kinematics of this assembly strategy are that of a three dimensional zipper a single degree of freedom is necessary to pull the zipper assembly head along the structure this degree of freedom may be actuated by external systems or even the mass and inertia of the motion of an initial seed assembly sequence where gravity provides the constant pulling force that drives the elements through the assembly head the discrete elements may be stored in a magazine cartridge reel or hopper type of system an active carrier based method of assembly is possible where the discrete elements have a distance constraint formed by a rigid intermediary component connected by pivots composing the discrete elements into a chain a rack and pinion type of arrangement of rollers feeds the elements into the lattice while locomoting along the lattice the rigid elements pivot on their integrated carrier as they roll along the rollers similar to a chain on a sprocket the arrangement of adjacent rollers enables connecting the chains into volume enclosing structures another embodiment of the assembler trades the carrier distance constraint for a mechanical timing constraint in this way the discrete elements require no carrier the track still provides the passive trajectory control while an active mechanism times the dispersal of discrete elements from their storage location and along the track the latching may be performed.