In this study, we have characterized physico-chemical properties of fully aliphatic poly(butylene succinatedilinoleic succinate)(PBS-DLS) copolymers modified with PEG with fine-tuned chemical structure and properties making them suitable for melt and solution processing. Polymer filaments fabricated in situ during extrusion of a polymer melt directly from the reactor were found suitable for 3D printing without further post-processing. These new semicrystalline copolymers showed well developed spherulitic morphology, but the presence of crystallites and the crystallization of polymers did not impede the volume changes which could result in shrinkage, warping or delamination of printed layers. Importantly, incorporation of PEG 6000 into copolymers improved their hydrophilicity. All copolymers were also suitable for electrospinning showing lower fiber diameter (ca. 400 nm) for PBS-DLS 70-30 compared to slightly thicker fibres, i.e. 600 nm for PBS-DLS 60-40. Additionally, all copolymers showed cell viability higher than 70% according to ISO 10993-5, indicating good biocompatibility and potential for biomedical applications. Overall, our results indicate that fully aliphatic PBS-DLS-PEG copolymers have excellent melt and solution processibility, rubber-like elasticity, and tailored physical characteristics that can be controlled through changes in the segmental composition. These characteristics, combined with their good biocompatibility, make these copolymers potential candidates for use in a variety of applications, including biomedical applications.