Printrboard Rev D All In One 3D Printer Electronics (INCLUDES Stepper Drivers!) OEM Quality Board With Heavy Duty Traces for Heated Beds (Unlike Some Low Quality Clones) INCLUDES 4 Allegro 4982 Stepper Drivers Built Into Board Onboard SD Card Slot for Computer Free Printing 3 MOSFETS for Extruder / Heated Bed / Fan Inputs for 2 Thermistors & 3 End Stops