3D Printer Kit, RAMPS 1.4 Controller Board + MEGA2560 R3 A4988 With Heat Sink USB Calbe Jumper Kit

[RAMPS 1.4 Controller] --- The RAMPS 1.4 board is designed to fit the entire electronics needed for a RepRap in one small package for low cost.RAMPS interfaces an Mega with the powerful MEGA platform and has plenty room for expansion. [Specification] --- Mega is an ATmega2560 as micro-controller development board itself has 54 groups digital I / O input / output terminal (14 groups do PWM outputs), 16 sets of simulation than the input side, group 4 UARTs (hardware serial ports), using the 16 MHz crystal oscillator. [Advantage] --- The modular design includes plug in stepper drivers and extruder control electronics on an MEGA shield for easy service, part replacement, upgrade-ability and expansion.Additionally, a number of expansion boards can be added to the system as long as the main RAMPS board is kept to the top of the stack. [Easy to Use] --- With the boot-loader, download the program directly via USB without having to go through other external writer.Supply part of the optional USB power, or as an external power using the AC-to-DC adapter and battery. [Function] --- Development IDE interface is based on open-source principles, allows you to download for use in project work, school teaching, motor control, interactive works.A4988 driver is a carrier board or breakout board for Allegro's A4988 DMOS micro-stepping driver with translator and Over current by Pololu;