Multimaterial additive manufacturing offers the potential to create functionally graded components from highly filled photocurable particle-reinforced composites (PRCs). While prior research has focused on 3D printing photocurable slurries with high volume loadings, the mechanical properties of multimaterial interfaces have not been measured. Furthermore, the effects of spatially varying photocuring on highly filled PRCs have not been quantified. To address these issues, this study isolated the