Additive manufacturing (AM) has significant advantages over conventional manufacturing technologies. AM constructs objects by adding materials layer-by-layer based on computer-guided design that not only reduces the time for product delivery but also enables complex print geometries which are difficult to achieve via conventional routes. Fused deposition modeling (FDM), one of the most promising AM techniques, has gained considerable attention for 3D printing of thermoplastic polymers. In FDM, polymer filaments are extruded from a spool through a heated nozzle and deposited onto a build stage to form thin layers that solidify with subsequent layers. Despite its' introduction in the 1980s, FDM has not achieved parity with the parent material properties that are produced using established manufacturing techniques. This is driven by weak interfilamentous welding inherent to the discontinuous layer-by-layer deposition process. Consequently, the inhomogeneous mechanical properties of filament bulk and interfaces make most FDM products unsuitable for load-bearing applications. Extensive experimental efforts have been made to improve interlayer bonding quality in FDM products through process optimization and material selection. For instance, Bhandari et al. summarized several technical methods to enhance the interfacial bond quality including microwave heating, infrared heating, optimization of printing parameters, and annealing. Seppala et al. reported that the bond time for acrylonitrile butadiene styrene (ABS) increases from 0.01s to 0.1s as the nozzle temperature increases from 210 • C to 270 • C, elevating the interfacial tear energy by 160%. This improvement is attributed to enhanced molecular diffusion between filaments due to lower viscosity and higher molecular mobility at elevated temperatures. Similarly, Yin et al. found that the interfacial bond strength between thermoplastic polyurethane (TPU) and ABS increases from 0.86 MPa to 1.66 MPa as the bed temperature is heated from 30 • C to 68 • C. This occurs because increasing the bed temperature, which sets the minimum temperature for the infill laying process, extends the time window for molecular diffusion between adjacent layers. Additionally, reducing the print speed from 50 mm/s to 20 mm/s decreased the void fraction of polylactic acid (PLA) by roughly 30%, and increased the torsional storage modulus by up to 0.14 GPa. Wang et al. compared the interlayer shear strength of ABS, polycarbonate (PC), and PLA, observing the highest strength in PC and the lowest in ABS. Despite significant experimental efforts to address the heterogenous interfilamentous mechanical properties, most reports focused on tuning processing parameters such as nozzle/bed temperature and printing speed, or chemical properties of polymers. However, precise control of these factors requires more flexibility with printing process and specialized equipment that inevitably increase the cost of FDM production. In this study, we attempt to focus on tuning intrinsic materials characteristics to enhance interlayer bonding during printing process. Materials modification has been attempted in the past to induce melt-assisted 3D printability of branched oligomers lacking a melt phase. Solvent-free physical mixing of materials enabled a miscible blend of branched phenolic oligomers within a linear polymer matrix, facilitating 3D printability by ensuring uniform distribution and time-dependent mechanical properties in the printed structure as it cools to room temperature. The relaxation dynamics, influenced by the slow crystallization kinetics of the matrix over a 4 -7 hour period, played a crucial role in controlling the mechanical properties of 3D-printed materials. Copolymeric compositions of similar building blocks exhibited instantaneous interlayer adhesion due to fast relaxation dynamics of the material. Inspired by these results, we hypothesize that interfilamentous mechanical properties can be effectively tuned by altering polymer topology, because polymer topology has a significant impact on rheology, and segmental dynamics which affects the interdigitation of polymers between adjacent filaments. Our exploration focuses on understanding how the sidechains of branched polymers affect interfilamentous mechanical properties. To that end, we conducted coarse-grained molecular dynamics (CGMD) modeling of interfilamentous diffusion of polymers consisting of various topological architectures.