Line cutter / Knife

When we cut out a certain pattern, we use scissors or a knife. However, scissors cause unnecessary cut and a knife can make unclear cut. Is there any way to clearly cut only what you want?
Line Cutter helps you have what you want. At the bottom of this mini machine, a small sensor, which senses a line, is attached. When the sensor senses the line you draw, Line Cutter moves on the line. When Line Cutter moves, the knife built in it cuts the pattern you want.