This study investigates the fundamental rheological properties that determine Direct Ink Writing (DIW) printability, with particular focus on the role of polyethylene glycol (PEG) in modifying these properties across different material systems. By systematically analyzing shear rate ramps and yield stress recovery, we confirm PEG’s ability to facilitate the transition from non-printable to printable materials. Expanding beyond PDMS, we investigate whether similar rheological improvements can be achieved in polyisoprene, polybutadiene, and particle-based suspensions, demonstrating the broader applicability of PEG-silica interactions. Additionally, we address reproducibility challenges by refining mixing and degassing protocols, ensuring consistency in rheological measurements. Our findings contribute to a generalized framework for linking rheological behavior with DIW printability, providing insights into material formulation strategies for advanced additive manufacturing applications.
