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If you're looking to build a network-connected device with Arduino Nano is the best solution for you!
The optical endstop is the best solution for any type of 3D printers and other CNC or 3D tools.
This simple set for 3D printer base on microcontroller Mega 2560 + RAMPS 1.4 + motor drivers, it is a solution for
Relay Shield for Arduino Uno, 4 relays