BIGTREETECH SKR 3 EZ is a successor to the motherboards of the SKR 1.4 Turbo and SKR 2 series and has many new functions. This versatile 32-bit mainboard with a powerful 480Mhz ARM-Cortex-M7 STM32H743VI CPU is suitable for most 3D printers and offers many interfaces and upgrade options compared to most built-in motherboards.
The mainboard is compatible with Marlin, Klipper and RepRap open-source software.


  • 32-bit ARM Cortex-M7 MCU with 480MHz
  • 5 stepper driver slots, Standard (TMC) and EZ compatible
  • Up to 6 stepper motors can be connected.
  • WIFI interface connection
  • Thermal runaway protection circuit
  • Extended protection circuit for thermistors
  • Supports BigTreeTech TFT displays as well as LCD12684, LCD2004
  • Connectors for PWM fans
  • Interface for closed loop stepper motor
  • High performance MOSFET
  • Supports BL Touch, filament runout sensor
  • Auto power down enabled (separate relay required)
  • Power Loss Recover Feature (separate UPS module required)
  • Dimensions: 109.7x98mm
  • Hole spacing: 102x76mm


  • 12V / 24V input voltage
  • 5 stepper driver slots (SPI, UART, STEP / DIR)
  • 6 stepper motors can be connected (dual Z axis)
  • 1 Micro SD card reader
  • 1 USB socket
  • 1 USB port
  • 1 WIFI interface for ESP-12S, ESP-07, ESP32 module
  • 2 connections for heating cartridges
  • 1 connection for heating bed
  • 3 temperature sensor connections (1 100K NTC, 2 100K NTC and PT1000 Optional)
  • 3 connections for one fan
  • 3 connections for PWM fans
  • 1 connection option for BL-Touch sensor
  • 3 connections for limit switches
  • 1 filament runout connection option
  • Supports 12V-48V (48V only supported with 5160 Pro Stepper Drivers)

More information, firmware and instructions are available here

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