Powerful mainboard with many interfaces

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Product information & technical details


BIGTREETECH SKR 3 is a successor to the SKR 2 and has many new functions. This versatile 32-bit motherboard with powerful 480 Mhz ARM Cortex-M7 is suitable for most 3D printers and offers many interfaces and upgrade options compared to most built-in motherboards.

The motherboard is compatible with Klipper and Marlin open-source firmware.

480Mhz ARM Cortex-M7

BIGTREETECH SKR 3 uses a 32-bit ARM Cortex-M7 series STM32H743VIT6 chip with a core frequency of 480MHz, providing enough performance to handle even the most demanding user interfaces while enabling stutter-free printing.

DIY friendly

  • BOOT0 facilitates DFU mode to flash firmware
  • The upgraded thermistor input now requires no external module for P1000
  • A universal WiFi modular port allows the use of RRF firmware

SKR 3 compared to SKR 2 and SKR 1.4

Mainboard SKR 3 SKR 2 SKR 1.4
Main chip STM32H743VIT6 STM32F407VGT6 LPC1768

Core frequency

480MHz 168MHz 100MHz
Output current 5A 4A 3A
CNC fan 3 (24V, 12V, 5V optional) 3 1
PC interface USB USB USB

Firmware support

Marlin, Klipper Marlin, RepRap Marlin

Temperature sensor interface

1-way 100K NTC, 2-way 100K NTC, PT1000 optional TH0, TH1, TB, 3-Way 100K NTC (Thermistor) TH0, TH1, TB, 3-way 100K NTC (Thermistor)
WiFi interface ESP-12S, ESP-07S, ESP32 ESP-12S, ESP-07S ESP-01S
Reserved BOOT0 Yes no no
Onboard EEPROM Yes no no

Product Specifications

Product size 110x85mm
Installation size 102x76mm
Processor ARM Cortex-M7 CPU STM32H743VIT6
EEPROM 24C32 32-Kbit

Input voltage


Logic voltage

DC 3.3V
Firmware Marlin, Klipper
WiFi interfaces

ESP-12S, ESP-07S, ESP32

Fan interfaces 3 CNC fans, 2 normal fans,

Optional CNC fan voltage

Extension interfaces

Servos, Probe, PS-ON, PWR-DET, Fil-DET, CAN FD
Motor drivers TMC5160, TMC2209, TMC2225, TMC2226, TMC2208, TMC2130, ST820, LV8729, DRV8825, A4988, etc.

Driver working modes

Motor driver outputs X, Y, Z (Dual Z-axis), E0, E1, five-way
Heating interface Heated bed (HB), heating cable (E0, E1)
Temperature sensor interface 1-way 100K NTC, 2-way 100K NTC, PT1000 optional
PC interface USB
File format Gcode
3D printer setup XYZ, Delta, Kossel, Ultimaker, Corexy
Recommended software Cura, Simplify3D, Pronterface, Repetier-host, Makerware
Screen Serial touch screen, SPI touch screen, LCD display

An image with the connections and the dimensions of the mainboard can be found in the pictures.

Customer Reviews

English reviews written for BIGTREETECH SKR 3

1 customer review in all languages

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