Methods, apparatus, systems and articles of manufacture are disclosed relating to 3D-printed structures. An example method of building a sensor with a 3D printer includes building a first conductive substrate and building a second conductive substrate. The example method also includes building a dielectric structure between the first conductive substrate and the second conductive substrate, the dielectric structure including a first latticed structure including a first plurality of legs extending inwardly at a first angle and a second latticed structure including a second plurality of legs extending inwardly at a second angle.