Fully assembled & tested, no soldering required It is designed to fit the entire electronics needed for a RepRap in one small package for low The modular design includes plug in stepper drivers and extruder control electronics on an Arduino MEGA shield for easy service, part replacement, upgrade-ability and expansion A number of Arduino expansion boards can be added to the system as long as the main RAMPS board is kept to the top of the stack It has Cartesian robots and requirements of the extruder 0