RepRap Arduino Mega Pololu Shield, known affectionately as RAMPS, is the brain for most of the 3D printers. It is designed to fit the entire electronics needed for a RepRap in one small package for low cost.
RAMPS interfaces an Arduino Mega with the powerful Arduino MEGA platform and has plenty room for expansion. The modular design includes plug in stepper drivers and extruder control electronics on a single Arduino MEGA shield. It uses Pololu Stepper Drivers delivering up to 1/16 microstepping. Four drivers are needed to move most 3D printers, with 3 going to the axis & one driving the extruder. An optional fifth stepper driver socket has been provided for additional applications.The board has 3 high power switched (By MOSFETS) outputs fused to 5 A and 11 A outputs for printbed and extruder.The RAMPS board electronics package has following features: