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I made this design many videos ago. Its a base for holding an Arduino or CHIPINO module that works well with my book:
Arduino - A Beginner's Guide to Programming Electronics.
I'm sharing three main chapters here that can help you understand how your 3D Printer works.
Chapter 2 - Flash an External LED (Digital Output Example)
Chapter 6 - Sensing a Switch (Digital Input Example)
Chapter 7 - Read a Potentiometer (Analog to Digital Converter Example)
Download the file to get the .stl and the free three chapters.
