A printer consists of several key components that work together to produce printed documents. The main parts include the print head, which applies ink to the paper, and the ink cartridges, which hold the ink. The paper tray stores the sheets to be printed, while the control panel allows users to manage print settings and monitor the printer's status. Additionally, the roller mechanism feeds the paper through the printer, ensuring it aligns correctly for printing. The power supply provides the necessary energy for operation, and the circuit board controls the printer's functions, coordinating the actions of all components for efficient printing.