Three-dimensional printed sensors

A method comprising:

• measuring a capacitance of a dielectric region of a three-dimensional (3D) printed humidity sensor on a surface of a 3D printed object,
• wherein the capacitance is indicative of a humidity condition of the 3D printed object,
• wherein the 3D printed humidity sensor includes the dielectric region disposed between electrodes,
• wherein the dielectric region is formed by an additive manufacturing process in which dielectric build material is deposited and selectively fused, on a layer-by-layer basis, such that fused together dielectric build material forms the dielectric region,
• wherein upon formation by the additive manufacturing process the dielectric region includes fused dielectric build material and one or more than one of partially fused dielectric build material, underfused dielectric build material, unfused dielectric build material remaining in the dielectric region of the 3D printed humidity sensor,
• wherein the one or more than one of the partially fused dielectric build material, the underfused dielectric build material, and the unfused dielectric build material corresponds to a porosity to the dielectric region,
• wherein the porosity is selected to facilitate infiltration of a compound within the dielectric region,
• wherein a controller integrated with a body of the 3D printed object applies voltages to the electrodes of the 3D printed humidity sensor such that the capacitance is measured, and
• wherein the capacitance is based on the infiltration of the compound within the dielectric region;
• and
• determining, from a database, a humidity for the 3D printed object based on the capacitance of the dielectric region.

A non-transitory machine-readable storage medium storing instructions that when executed by a processor, cause the processor to:

• determine a first capacitance from a measurement of a three-dimensional (3D) printed sensor integrated on a 3D printed object,
• wherein the 3D printed sensor includes a dielectric region disposed between electrodes,
• wherein the dielectric region is formed by an additive manufacturing process in which dielectric build material is deposited and selectively fused, on a layer-by-layer basis, such that fused together dielectric build material forms the dielectric region,
• wherein upon formation by the additive manufacturing process the dielectric region includes fused dielectric build material and one or more than one of partially fused dielectric build material, underfused dielectric build material, unfused dielectric build material remaining in the dielectric region of the 3D printed sensor,
• wherein the one or more than one of the partially fused dielectric build material, the underfused dielectric build material, and the unfused dielectric build material corresponds to a porosity to the dielectric region,
• wherein the porosity is selected to facilitate infiltration of a compound within the dielectric region,
• wherein a controller integrated with a body of the 3D printed object applies voltages to the electrodes of the 3D printed sensor such that the first capacitance is measured, and
• wherein the first capacitance is based on the infiltration of the compound within the dielectric region;
• determine a second capacitance from a measurement of a calibration sensor on an interior of the 3D printed object;
• and
• determine, from a mapping between capacitance and humidity values, a humidity at the 3D printed sensor based on the first capacitance and the second capacitance.