HOW I'M BUILDING IT
So far, I worked around 20 hours in this project. All the work is being done by myself.
I designed it with Fusion 360. I have printed all the parts with an Anycubic Kossel Linear Plus 3D printer.
I'm using a simple Arduino Uno for the device, programming it in C++11.
The metal ball localization is been made by a resistive touchscreen.