Affordable and modular ground robots are key in robotics research and education. However, many existing platforms rely on expensive hardware and rigid architectures, limiting their reproducibility and practical deployment in resource-constrained environments. This work presents the design and implementation of a low-cost, 3D-printed omnidirectional robot that combines mechanical flexibility with modern embedded software capabilities. The proposed system features a lightweight fused deposition modeling-printed chassis, mecanum wheels for holonomic motion, and a Raspberry Pi 5 as its central processing unit. The ROS 2 framework integrates all core functionalities, including sensor acquisition, control logic, and real-time teleoperation. The system supports full ROS 2 compatibility and can be a foundation for further autonomous capabilities, such as SLAM and navigation. Extensive engineering validation confirms that the platform operates reliably under manual control and provides a reproducible, extensible base for future research.