(1) 3D Printer Controller RAMPS 1.4 The RepRap Arduino-compatible MEGA Pololu Shield or RAMPS for short. It is designed to fit the entire electronics needed for a RepRap in one small package for low cost. RAMPS interfaces an Arduino-compatible Mega with the powerful Arduino-compatible MEGA platform and has plenty room for expansion. The modular design includes plug in stepper drivers and extruder control electronics on an Arduino-compatible MEGA shield for easy service part replacement upgrade-ability and expansion. Additionally 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. Version 1.4 uses surface mount capacitors and resistors to further cover edge issue cases. (2) Arduino-Compatible Mega 2560 R3 Fully compatible with original Arduino MEGA 2560 R3 with this product you are able to use all the Arduino open source platform to create or learn interactive objects it will be a lot of fun while you are creating and learning it so just get this and start it we also provide reference pdf files that can help you to improve skills very quickly . after all time matters the sooner you can improve your programing skills the sooner you can create amazing projects ! Compared with UNO R3 this is with main Chip ATmega2560 with more I/O Pins and additional 10 PWM output of course the EEPROM is also with larger space. (3) A4988 StepStick Stepper Motor Driver Module A4988 is a complete microstepping motor driver with built-in translator for easy operation. This product is available in full half 1/4 1/8 and 1/16 step modes operate bipolar stepper motors output drive capacity of up to 35 V and