Automated liquid handling robots are indispensable for high-throughput workflows, ensuring precise liquid transfers and reproducibility of experiments. However, their full automation potential is often limited by the high cost and complexity of integrating automated labware handling . This bottleneck, characterized by the expense and limited accessibility of such systems , is particularly evident in older, yet still capable robots like the Opentrons OT-2, which lack readily available, cost-effective labware handling solutions. This paper addresses this critical gap by presenting a 3D-printed robotic plate handler, designed for seamless integration and adaptable labware manipulation. Leveraging opensource Raspberry Pi programming and readily available materials, this hardware significantly reduces the financial barriers to advanced automation. This manuscript provides an overview of the robotic plate handler, detailing its design, hardware assembly, and operational procedures. Specifically, it demonstrates the plate handers's application on Opentrons OT-2, showcasing its utility in enhancing laboratory automation. The hardware's adaptability allows for integration with various liquid handling platforms utilizing a moveable gantry, maximizing compatibility and expanding the range of automated procedures. Produced using computer-aided design (CAD) for precise fabrication, this device offers a cost-effective solution for automating labware movement, a functionality often restricted to higher-end robotic systems. Technologically, it advances the state-of-the-art by providing an accessible, open-source solution for automating a critical aspect of laboratory workflows, thus democratizing advanced automation capabilities. Building upon the principle of a similar design [6], we developed the robotic plate handler using CAD software (Error! Reference source not found.a). The design comprises two primary components: an upper main body for vertical motion and a lower sliding body for horizontal gripping. Both components were fabricated using PLA filament on an UltiMaker S3 3D printer. The lower sliding body, responsible for gripping, incorporates a main sliding body, front and back sliders, reinforced grippers, a stopper, and a servo gear (Error! Reference source not found.b). We judiciously placed cutouts to house the servo motor and self-tapping screw holes. A notch on the back slider interfaces with the stopper, precisely controlling the gripper's opening and closing range. The upper main body, features cutouts for both the servo motor and vertical movement rail, as well as support brackets for secure mounting to the Opentrons OT-2 gantry via nuts (Error! Reference source not found.c). The lower sliding body, responsible for gripping, features a vertical rail with a central channel to accommodate servo wiring (Error! Reference source not found.d). A gear mechanism provides precise vertical movement (Error! Reference source not found.e). This design facilitates simple hardware assembly, eliminating the need for adhesives or specialized tools. The electronic control system consists of a Raspberry Pi Zero WH with a servo HAT for motor management. The Raspberry Pi, running Python scripts, communicates with the Opentrons OT-2 via a UART serial connection through the OT-2's USB port. Preloaded scripts on the Raspberry Pi enable predefined functions, which can be triggered either by procedures within scripts run on the OT-2 or by individual terminal commands executed through the same interface. This single USB connection serves dual purposes: maintaining serial communication (115200 bps) and providing 3.3V DC power to the Raspberry Pi via the UART cable from the OT-2. Servo wires were extended to connect the servo motors to the Raspberry Pi. The entire electronic assembly utilizes cheap, readily available, commercially supplied components.