Structural health monitoring (SHM) is undergoing a major shift: from traditional surface-mounted sensors, which introduce parasitic mass, wiring complexity, and environmental vulnerability, alternative routes such as highly integrated "smart" components are being sought. By seamlessly incorporating sensors within structural volumes, this approach allows measurement to be performed in direct contact with the point of interest. This work explores the fabrication of such devices using multi-material fused deposition modeling (FDM) and conductive polymer composites (CPCs), where the polymer matrix plays a load-bearing role and conductive inclusions enable piezoresistive self-sensing. Specifically, this research focuses on the design and characterization of a prototype CPC sensor embedded inside an eVTOL landing gear, aimed at predicting structural degradation and thus improving sustainability.