In at least one embodiment, a paint applicator robot is provided. The robot may include a robotic arm including a hollow joint and a paint applicator, a color tree disposed between the hollow joint and the paint applicator, and a dual-lumen line extending through the hollow joint to the color tree. The dual-lumen line may include a paint supply path to the color tree and a paint return path from the color tree. The robot may include a plurality of the dual-lumen lines, for example, up to 48 dual-lumen lines, each providing a paint color to the color tree. The robot may be included in a robotic paint station and may be configured to receive paint from and return paint to a drop box connected to a paint recirculation system.