Organic electrochemical transistors (OECTs) require high transconductance, benefiting from increased channel volume. Inkjet printing is a non-contact technique that enables flexible control over channel thickness, making it suitable for OECT fabrication. However, conventional DBSA-based PEDOT:PSS inks show limited process stability under fine-nozzle conditions due to foaming. In this study, ionic (DBSA, SDS) and nonionic (Triton X-100, DYNOL-604) surfactants were compared to evaluate their effects on foaming behavior, wettability, electrical conductivity, and printing behavior of PEDOT:PSS inks. DYNOL-604-based PEDOT:PSS inks effectively suppressed foaming while maintaining electrical conductivity comparable to DBSA-based inks and sufficient wettability. Based on these properties, stable single-droplet formation and printting stability were achieved down to a 30 μm nozzle. This study demonstrates that low-foaming surfactant design enables stable inkjet printing for OECTs.