The RAMPS 1.4 board fit all electronics needed for a RepRap in one small, low-cost package. RAMPS interfaces with the powerful Arduino MEGA platform and has plenty of room for expansion. The modular design includes extruder control electronics and plug-in stepper drivers on an Arduino MEGA shield. It makes for easy service, part replacement, upgradability and expansion. In addition, you can add a number of Arduino expansion boards to the system provided the RAMPS board remains on top of the stack.