# BigTreeTech SKRat V1.0

> Compact 32-bit 3D printer control board with STM32G0B1VET6 MCU, 5 stepper driver slots, CAN-FD bus, USB-C, and support for both Marlin and Klipper firmware.

## Quick Facts

- **Brand:** BigTreeTech
- **Board Type:** 3D Printer Control Board
- **Price:** ~$39
- **Product Readiness:** consumer
- **CPU:** STM32G0B1VET6
- **CPU Architecture:** ARM Cortex-M0+
- **CPU Cores:** 1
- **RAM:** 144KB
- **Flash:** 512KB
- **USB:** USB Type-C
- **Power:** DC 12V–24V
- **Operating Voltage:** 3.3V
- **Dimensions:** 110 x 85 mm
- **SD Card:** microSD

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** Yes

## Compatible Firmware

Marlin, Klipper

## Use Cases

- 3D Printing

## Components

- **STM32G0B1VET6** (mcu): STMicroelectronics 32-bit ARM Cortex-M0+ at 64MHz, 512KB Flash, 144KB SRAM with USB, CAN-FD, UART, and SPI. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.st.com%2Fresource%2Fen%2Fdatasheet%2Fstm32g0b1re.pdf&ref=openhardware.directory&product=bigtreetech-skrat-v1-0&source=md-export)

## Protocols

- **UART**
- **SPI**
- **I2C**
- **USB**
- **CAN-FD**

## Description

## Overview

The BigTreeTech SKRat V1.0 is a compact and affordable 3D printer control board based on the STM32G0B1VET6 ARM Cortex-M0+ microcontroller running at 64MHz. It is designed for smaller 3D printers and features 5 stepper driver channels — X, Y, Z (with dual-Z support), E0, and E1 — accepting STEP/DIR, UART, and SPI mode drivers. The board targets an entry-level price point at $39 while still including modern features like CAN-FD.

The SKRat includes 5 NTC thermistor ports plus 1 PT100/PT1000 port for precise temperature monitoring. Fan outputs include 4 two-wire PWM fan ports, 1 always-on fan port, and 2 four-wire PWM fan ports with tachometer support for speed monitoring. Motor voltage is jumper-selectable between 5V, 12V, and VIN. An onboard CAN-FD port enables connection to BigTreeTech's EBB CAN toolhead boards for simplified wiring in modern printer builds.

Expansion options include an SPI port (3.3V/5V selectable), UART expansion output, and I2C expansion header. A microSD slot is provided for firmware updates and printing from SD card. The board measures a compact 110×85mm, making it suitable for printers with limited space. Both Marlin and Klipper firmware are supported, with open-source schematics and PCB design files available on the BigTreeTech GitHub repository.

## Where to Buy

- [BIQU Equipment](https://openhardware.directory/r?to=https%3A%2F%2Fbiqu.equipment%2Fproducts%2Fbigtreeetech-skrat-v1-0-control-board&ref=openhardware.directory&product=bigtreetech-skrat-v1-0&source=md-export) — $39.00

## Resources

- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fbigtreetech%2FSKRat&ref=openhardware.directory&product=bigtreetech-skrat-v1-0&source=md-export)
- [product](https://openhardware.directory/r?to=https%3A%2F%2Fbiqu.equipment%2Fproducts%2Fbigtreeetech-skrat-v1-0-control-board&ref=openhardware.directory&product=bigtreetech-skrat-v1-0&source=md-export)
- [wiki](https://openhardware.directory/r?to=https%3A%2F%2Fglobal.bttwiki.com%2FSKRat.html&ref=openhardware.directory&product=bigtreetech-skrat-v1-0&source=md-export)

## Tags

`3d-printer`, `control-board`, `stm32`, `stm32g0`, `marlin`, `klipper`, `stepper-driver`, `can-fd`, `compact`, `bigtreetech`, `open-source`, `cortex-m0+`, `skrat`

## Images

![BigTreeTech SKRat V1.0](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-skrat-v1-0/d60ff22194d5.jpg)
![BigTreeTech SKRat V1.0](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-skrat-v1-0/637711de2c17.jpg)
![BigTreeTech SKRat V1.0](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-skrat-v1-0/17f26cd42747.jpg)
![BigTreeTech SKRat V1.0](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-skrat-v1-0/477215b47d40.jpg)
![BigTreeTech SKRat V1.0](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-skrat-v1-0/957c2b084186.jpg)
![BigTreeTech SKRat V1.0](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-skrat-v1-0/f9dad573bdff.jpg)
![BigTreeTech SKRat V1.0](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-skrat-v1-0/c4e107da401a.jpg)
![BigTreeTech SKRat V1.0](https://nbg1.your-objectstorage.com/openhardware-directory/entities/bigtreetech-skrat-v1-0/e49eacd0dfe2.jpg)

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