The processing of natural biopolymers by Fused Deposition Modeling (FDM) opens perspectives for applications in food and health domains by taking advantages of their edibility, biocompatibility and resorbability. Glycerol plasticized zeins (proteins from maize kernels) present thermomechanical properties matching the extrusion step requirements of FDM at T_printing=130°C for 20% of glycerol. The present work focuses on the fusion-bonding step of the process between adjacent filaments. Mechanisms at the root of the thermal bonding of amorphous polymers at T>Tg refer to melts surface tension (Γ, driving force) and viscosity (η, limiting force). In addition, healing, assessed by the degree of healing Dh, increasing with time as Dh∝t^1/4, is based on polymer chains diffusion across the interface, following the reptation theory. Dynamic rheological properties of molten extruded filaments of plasticized zeins were determined in a pre-heated oscillatory rheometer at 130°C, with viscosity ranging from 0.6 to 0.8kPa.s. A routine was programmed in Matlab® in order to estimate Γ from the evolution of the fusion-bonding neck growth between two extrudates (polymer sintering model). The bonding rate was measured at about 0.1mm.s-1 at 130°C. Then, zeins melts surface tension was estimated between 30 and 40mN.m-1. These results were confirmed by extrapolating from measurements conducted at 20°C using the sessile drop method, with a typical surface tension dependence dγ/dT≈-0.05mN.m-1.K-1 following Eötvös’ law. By varying the liquids deposited on zein-based surface and following Owens and Wendt’s approach, γ_SV was found to amount to 39.2±1.6mN.m-1, with the dispersive component γ_SV^d=4.2±0.4mN.m-1 and the polar one γ_SV^p=35.0±1.2mN.m-1. Once completed by the characterization of thermal properties of molten plasticized zeins, these results will fuel the modelling of the cohesion of layered parts, as to target the printing of resorbable matrixes to control active ingredients release.