Open source ATMega-based board for 3D printers, soft material CNC routers, engravers, etc.Universal, high quality and easy to use. Use the mainboard with the DRV8825 stepper driver board VM8400DB (not included). Features: Outputs to drive 5 Stepper motors, 2 Heaters, Heated Bed & 2 Fans. Inputs for Stepper motor end stops & heater sensors. Includes I/O Interface for LCD, SD Card etc. Suitable a spare for the Velleman Vertex K8400 3D printer kit.