Description: This is the new 3D Printer Starter Kit, developed specially for those beginners who are interested in 3D printer. You will have a complete set of Sainsmart"s most common and useful electronic components. What"s more. We will offer you a detailed tutorials including project introduction and their source codes. Please contact our customer service for the tutorials link. MK2B PCB Heatbed 12V/24V for 3D Printer RAMPS1.4 MK2b is the latest and the best type of heatbed money can buy as of today. 100% compatible with all Prusa and Mendel 3d printer variants. Package list: 1 x RAMPS 1.4 1 x Mega 2560 R3 1 x SD RAMPS Breakout Board 5 x A4988 driver 1 x USB Cable 1 x RAMPS 1.4 wiring cable 6 x Mechanical Endstop Switch 1 x Cooler Fan for 3D ramps 1 x MK2b