Arduino Mega 2560 R3 Drop in T-Nut for V-Slot Aluminum Bar (5mm) Note: the middle 4 pins

Note: the middle 4 pins (GPIO0

4 mm hole permits more precise filament extruding without jamming

while there is an Infrared receiver to get the signals on the other side

Instructables detailed tutorial Wiring 3D Printer RAMPS 1

Runs up to 20MHz with external crystal

Arduino Mega 2560 R3 Drop in T-Nut for V-Slot Aluminum Bar (5mm) Note: the middle 4 pinsThe Mega R3 is backwards compatible with the arduino mega same driver, same uploading, same look and work with the existing shields but can adapt to new shields. Description The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has 54 digital input output pins (of which 14 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header,