A research team at California State University, Chico, has developed a non-destructive testing method based on computational vibration analysis, identifying defect locations by measuring changes in natural frequencies caused by stiffness loss from voids, pores, and other defects. The study intentionally introduces voids at different positions in pipes or beams, recording their impact on natural frequencies, and is particularly effective for hollow tubular parts—a very common shape in the aerospace industry. The ultimate goal is to build a database of defect locations versus natural frequency shifts, enabling future reverse inference of defect position and size from measured frequency shifts, providing a fast, non-destructive method for detecting internal defects in 3D-printed parts.