Blends of polylactide (PLA) and rice husk (RH) were prepared using atwin-screw extruder and characterized for mechanical properties, and microstructure.Scanning electron micrographs illustrated the occurrence of phase separation inPLA/RH blends, leading to poor tensile properties. To strengthen the blendmechanical properties, methylene diphenyl diisocyanate (MDI) was added as aninterfacial compatibilizer, which would improve the tensile strength and notchedIzod impact of the composites containing RH (20–50 wt%). A porous morphology showingseveral connected voids was observed on the surface of all PLA/RH and PLA/RH/MDIcomposites buried in soil for specific periods of time. The size of the voidsconsiderably increased with the RH content. RH would be an excellent filler,compatibilized with MDI, to enhance the biodegradation and mechanical properties ofthe resultant environment-friendly composites for 3D printing applications.