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This study aims to enhance the mechanical properties of the 3D‐printed poly(lactic acid) (PLA) specimen fabricated by a photosensitive binder jetting via the method of dual curing and thermal treatment. The layer solidification was activated by light in light‐curing mode, and the combination of light and chemical in dual‐curing mode. The 3D‐printed specimens were then immediately subjected to thermal treatment at 120°C for 30 min. The effects on mechanical properties of 3D‐printed PLA specimens in terms of layer thickness, curing system, and thermal treatment were investigated using three‐point bending test. The results demonstrated that the dual curing improved monomer conversion and mechanical properties of the specimens in comparison with the light‐curing mode. The thermal treatment also increased monomer conversion and physically interfacial binding between PLA powder and binder matrix. The …