Polyhydroxybutyrate (PHB) and Polybutylene-co-adipate terephthalate (PBAT) biopolymers were synergistically compounded to create a compatible blend of filaments tailored for application in the additive manufacturing field. The characteristics of these filaments were subsequently bolstered through the incorporation of a nanofiller derived from oil palm trunk, nanofibrillated cellulose (NFC), aimed at fortifying the composite's mechanical properties while preserving its biodegradability.