Inspect and examine printed materials for quality and accuracy, ensuring that they meet the client's specifications and requirements. Perform routine maintenance on printing equipment, such as cleaning, lubricating, and replacing parts to ensure optimal performance. Printing press operators and printing press operator assistants prepare, operate, and maintain printing presses. Their principal duties include installing and adjusting printing plates, loading and feeding paper, mixing inks and controlling ink flow, and ensuring the quality of the final printed piece.