Abstract: A robotic automated storage and retrieval system (AS/RS) mixed pallet build system includes a rack that includes two or more verticals levels upon which items are stored. The system includes a three-dimensional robotic AS/RS that includes a carriage, robot arm, vertical lift, and horizontal propulsion system. The items from the rack are loaded upon the carriage to create a pallet. The robot arm is configured to stack the items from the racks onto the pallet. The vertical lift is configured to move the carriage vertically between the vertical levels of the racks. The horizontal propulsion system is configured to move the carriage horizontally along the rack so that the carriage is able to service the entire length of the rack. The three-dimensional robotic AS/RS also includes a stretch wrapper that progressively secures the layers of items on the pallet to prevent the items from falling off the pallet.