Most of the countries imposed rules and regulations for the replacement of petroleum based products with biodegradable composite materials. The object of the present work is development of biodegradable composites utilizing polylactic acid (PLA) as matrix and rice husk as reinforcement for energy saving applications. In this study, rice husk ranging from 0% to 10% was incorporated into a polylactic acid (PLA) to develop novel biodegradable 3D printing filaments via a melt extrusion process. Thermal conductivity and acoustic test samples were prepared via fused deposition modeling (FDM) method. The thermal and acoustic insulation of samples were examined using guarded thermal conductivity meter and an impedance tube method. Thermal conductivity of pure PLA was 0.164 W/mk. With the addition of rice husk to PLA thermal conductivity of composite decreased to 0.149 W/mk. Sound absorption coefficient (SAC) for PLA and composite was 0.60 and 0.79 respectively. As fiber content increased, thermal and acoustic insulation of 3D print composites increased. Hence, the present developed composites are used in the applications such as building and automotive industries for the reduction of power consumption. This investigation enhanced the value of rice husk waste, which is currently underutilized.