A flexible heater suitable for embedding in a wearable, comprising: a conformable substrate; characterized by the flexible heater further comprising: a matched function ink set, comprising matched additively printed matched function inks of the matched function ink set selected to achieve a particular fineness, pitch, density and consistency, and matched to at least: a receptivity of the conformable substrate onto which the matched function inks are printed; a conductivity of the conformable substrate; and a chemical reactivity as between the conformable substrate and the matched function inks, each of the matched function inks within the matched function ink set, and differing curing methodologies as between each of the matched function inks; the matched function ink set being printed in successive additively printed layers onto at least one substantially planar face of the substrate to form: at least one conductive layer capable of receiving current flow from at least one power source; at least one resistive layer electrically associated with the at least one conductive layer and comprising a plurality of heating elements capable of generating heat upon receipt of the current flow; and at least one dielectric layer capable of at least partially insulating the at least one resistive layer; wherein the matched ink set is matched to preclude detrimental interactions between the printed inks of each of the at least one conductive, resistive and dielectric layers, and to preclude detrimental interactions with the conformable substrate. a conformable substrate; characterized by the flexible heater further comprising: a matched function ink set, comprising matched additively printed matched function inks of the matched function ink set selected to achieve a particular fineness, pitch, density and consistency, and matched to at least: a receptivity of the conformable substrate onto which the matched function inks are printed; a conductivity of the conformable substrate; and a chemical reactivity as between the conformable substrate and the matched function inks, each of the matched function inks within the matched function ink set, and differing curing methodologies as between each of the matched function inks; the matched function ink set being printed in successive additively printed layers onto at least one substantially planar face of the substrate to form: at least one conductive layer capable of receiving current flow from at least one power source; at least one resistive layer electrically associated with the at least one conductive layer and comprising a plurality of heating elements capable of generating heat upon receipt of the current flow; and at least one dielectric layer capable of at least partially insulating the at least one resistive layer; wherein the matched ink set is matched to preclude detrimental interactions between the printed inks of each of the at least one conductive, resistive and dielectric layers, and to preclude detrimental interactions with the conformable substrate. a matched function ink set, comprising matched additively printed matched function inks of the matched function ink set selected to achieve a particular fineness, pitch, density and consistency, and matched to at least: a receptivity of the conformable substrate onto which the matched function inks are printed; a conductivity of the conformable substrate; and a chemical reactivity as between the conformable substrate and the matched function inks, each of the matched function inks within the matched function ink set, and differing curing methodologies as between each of the matched function inks; a receptivity of the conformable substrate onto which the matched function inks are printed; a conductivity of the conformable substrate; and a chemical reactivity as between the conformable substrate and the matched function inks, each of the matched function inks within the matched function ink set, and differing curing methodologies as between each of the matched function inks; the matched function ink set being printed in successive additively printed layers onto at least one substantially planar face of the substrate to form: at least one conductive layer capable of receiving current flow from at least one power source; at least one resistive layer electrically associated with the at least one conductive layer and comprising a plurality of heating elements capable of generating heat upon receipt of the current flow; and at least one dielectric layer capable of at least partially insulating the at least one resistive layer; wherein the matched ink set is matched to preclude detrimental interactions between the printed inks of each of the at least one conductive, resistive and dielectric layers, and to preclude detrimental interactions with the conformable substrate. at least one conductive layer capable of receiving current flow from at least one power source; at least one resistive layer electrically associated with the at least one conductive layer and comprising a plurality of heating elements capable of generating heat upon receipt of the current flow; and at least one dielectric layer capable of at least partially insulating the at least one resistive layer; wherein the matched ink set is matched to preclude detrimental interactions between the printed inks of each of the at least one conductive, resistive and dielectric layers, and to preclude detrimental interactions with the conformable substrate.