This item is for a cloned EinsyRambo 1.1b mainboard for your 3d printer.A great replacement part for MK3 MK3S or for use in your clone printer build.This motherboard is also fully supported in the Marlin , it can be used in any 3D printer build.4 TMC2130 stepper drivers with 1/256th microstepping and sensorless homing.4 outputs (1 Extruder, 1 Heatbed, 2 low power outputs for fans.Fans have 3pin connectors for RPM feedback.5V power to fans.Power2 power input rails.Heated Bed, 15A 1224V (15A dedicated fuse).Primary Power 10A 1224V: Motors, Logic & Fans (5A dedicated fuse) + Extruder (5A dedicated fuse).Built 5V generation from the Motors, Logic & Fans rail.Package Includes:1pc EinsyRambo 1.1b1pc USB4pcs heatsinksNote:Please item model before purchasing to make sure it fits perfectly.Please contact us firstly if there are any problems with the product.The item's color may be slightly different from the pictures due to the light and screen setting difference.Please allow slight dimension error due to manual measurement.Thanks for your kindly understanding.