This study introduces a novel method for 3D printing of luminescent perovskite quantum dot (PQD)-polymer composites using direct-ink writing (DIW). The ink is composed of PQDs and hydroxypropyl cellulose (HPC) dissolved in dichloromethane (DCM), enabling stable room-temperature extrusion. By adjusting the halide ratios, the ink exhibits single-peak photoluminescence emissions of red (639 nm), green (515 nm), and blue (467 nm). The method allows for the precise fabrication of complex 3D architectures, such as pyramids and Eiffel towers, with controlled emission colors. These structures can be used for advanced anti-counterfeiting and information encryption applications. The study demonstrates the potential of this 3D printing technique in enhancing the functionality of modern printed electronic devices.This study introduces a novel method for 3D printing of luminescent perovskite quantum dot (PQD)-polymer composites using direct-ink writing (DIW). The ink is composed of PQDs and hydroxypropyl cellulose (HPC) dissolved in dichloromethane (DCM), enabling stable room-temperature extrusion. By adjusting the halide ratios, the ink exhibits single-peak photoluminescence emissions of red (639 nm), green (515 nm), and blue (467 nm). The method allows for the precise fabrication of complex 3D architectures, such as pyramids and Eiffel towers, with controlled emission colors. These structures can be used for advanced anti-counterfeiting and information encryption applications. The study demonstrates the potential of this 3D printing technique in enhancing the functionality of modern printed electronic devices.