An autonomous lawnmower, called Grass Printer, has been designed to cut shapes and even words into grass. The design uses an autonomous lawnmower with four sensors on its four corners that allow it to selectively trim an area. Using small sized blades for accuracy the Grass Printer's tiny shaft-driving motors move the cutters horizontally and vertically for precision cutting. Grass Printer provides a way for people to decorate their lawn with creative cutting. Graphics can be cut into the grass based on an image that is sketched onto the mower’s touchscreen. The mower works within an area framed by sensor markers. Its blades are smaller than those on standard mowers, which allows for more rapid and accurate cutting. After the control system performs a series of calculations based on the sketch, small motors move the cutter shaft horizontally and vertically in accordance with the mower’s position within the sensor-defined area. Mowed grass is discharged at the rear.