The naïve solution found in thousands of Arduino tutorials do the same thing ... and there are a few things you can do in software to reduce the number of conflicts when using more than one ...

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.

He also wrote his own drawing software, with an interface that has ... He already had a motor shield for his Arduino but it supported only 2 servos, so he made his own 3-servo shield.