There is already a CNC project for Arduino called Grbl but [Reza’s] approach uses the Arduino libraries in an effort to make the sketch more customizable for the average user.

Learn how to build a mini CNC drawing machine using Arduino in this simple DIY project. This video guides through the process of creating an easy drawing machine at home, perfect for beginners ...

Let’s not ignore the essentially free counterweight that is used. For control, an Arduino with a CNC shield powers the three-axis device which is likely the bulk of the cost of this project.