Binder jet printing, an additive manufacturing process, is challenged by the presence of porosity and spatially varying microstructures in final parts. Previous studies have used destructive evaluation methods to characterize these features, but only one plane can be assessed at a time. Ultrasonic testing (UT) can be used to locate spatial variations in structure and properties. This research explores UT methods to evaluate varying thickness SS316L parts to investigate the size effect on microstructural homogeneity.