1. Introduction
The BIGTREETECH SKR 3 EZ V1.0 motherboard is a 32-bit 3D printer control board developed by Shenzhen Biqu Technology Co., Ltd. It is an updated version based on the SKR 3, specifically designed for compatibility with both the EZ series and TMC series drivers. This manual provides essential information for setting up, operating, and maintaining your SKR 3 EZ V1.0 motherboard.
Overview of the BIGTREETECH SKR 3 EZ V1.0 Motherboard.
2. Features
- Utilizes a 32-bit ARM Cortex-M7 series STM32H723VI main control chip for significantly improved performance.
- Power chip TPS5450-5A supports DC12/24V input, with an output current up to 5A (peak 6A), ideal for powering a Raspberry Pi.
- Features a dedicated BOOT button for DFU-based boot program updates.
- Enhanced thermistor protection circuit to prevent damage from heated bed or heating rod leakage.
- CNC fan voltage selection (24V, 12V, 5V) via an external power supply module, simplifying setup and reducing motherboard damage risk.
- Jumper-selectable pull-up resistance for thermistors, supporting PT1000 without external modules.
- Compatible with all versions of serial, SPI, and LCD screens.
- Easy firmware configuration updates via SD card.
- On-board DIAG function pins for simple jumper cap configuration.
- Supports advanced functions such as resume printing, filament runout detection, completed shutdown, BLTouch, and RGB lighting.
- High-performance MOSFETs are used to reduce heat generation.
- Features a replaceable fuse for easy maintenance.
- Includes a general interface for WIFI modules (ESP-12S, ESP-07, ESP32).
- On-board non-self-elastic MicroSD card slot with SDIO working mode for high-speed data transfer.
- Integrated EEPROM for saving parameter information.
- Two CAN interfaces (USB port and XH2.54 6Pin terminal) with a double-pole double-throw switch for selection.
- High-precision pull-up resistor for the temperature sensor interface.
- Dual drive sockets compatible with both EZ series and TMC series driver modules.
- Each motor drive module's voltage can be selected via a jumper cap.
- Motor power supply supports up to 48V, with an isolation chip to protect the mainboard from IO damage when using TMC5160 and EZ5160.
The motherboard features powerful 32-bit 480 MHz STM32H743VIT6 and 32-bit 550 MHz STM32H723VGT6 MCUs for maximum performance.
Isolation chips are added to protect the motherboard from potential damage.
3. Package Contents
- BIGTREETECH SKR 3 EZ V1.0 Motherboard
- USB Cable
- Jumper Caps (various quantities)
The package includes the SKR 3 EZ motherboard, a USB cable, and various jumper caps.
4. Setup and Installation
4.1 Driver Installation
The SKR 3 EZ V1.0 motherboard is designed for easy driver installation, supporting both EZ series and TMC series drivers. The EZ drivers feature a pinless structure, which simplifies insertion and removal, reducing the risk of bent pins.
This video demonstrates the installation of EZ drivers and highlights the pinless structure and other features of the SKR 3 EZ motherboard.
The EZ drivers are designed for easy, pinless installation, eliminating common issues like bent pins.
The motherboard is compatible with both TMC series and EZ series drivers.
4.2 Wiring Diagram
Refer to the detailed wiring diagram below for proper connection of all components to the motherboard. Ensure all connections are secure and correctly oriented before powering on the device.
Detailed wiring diagram for the BIGTREETECH SKR 3 EZ V1.0 motherboard, showing all ports and connections.
4.3 Fan Voltage Selection
The CNC fan interfaces offer optional voltage selection (5V, 12V, or 24V) through an external power supply module. This flexibility allows you to match your fan requirements without additional complex modifications.
Diagram illustrating the selection of 5V, 12V, or 24V for CNC fans using an external DC module (not included).
4.4 Firmware Update
Firmware can be updated easily via an SD card. Insert the SD card with the new firmware into the MicroSD card slot and power on the board. The board also supports DFU mode for boot program updates using the dedicated BOOT button.
The SKR 3 EZ V1.0 supports Klipper, Marlin, and RepRap (RRF) firmware.
5. Operating Instructions
Once installed and configured with the appropriate firmware, the SKR 3 EZ V1.0 motherboard is ready for operation. It supports various 3D printer structures and slicing software.
5.1 Supported Machine Structures
- Cartesian
- Delta
- Kossel
- Ultimaker
- CoreXY
5.2 Recommended Software
- Cura
- Simplify3D
- Pronterface
- Repetier-host
- Makerware
6. Maintenance
- Keep the motherboard clean and free from dust and debris. Use compressed air or a soft brush for cleaning.
- Avoid touching the electronic components directly to prevent electrostatic discharge.
- Ensure proper ventilation around the motherboard to prevent overheating.
- Regularly check all connections for tightness and proper seating.
- If a fuse blows, replace it with one of the same rating to prevent damage.
7. Troubleshooting
- Board not powering on: Check power supply connections and ensure the input voltage is within the DC12V-DC24V range. Verify the power chip (TPS5450-5A) is functioning.
- Drivers not recognized: Ensure drivers are correctly inserted into the sockets. Check jumper settings for driver working mode (SPI, UART, STEP/DIR).
- Motor issues (no movement, erratic movement): Verify motor wiring according to the diagram. Check motor voltage selection via jumper caps. Ensure correct driver installation and configuration in firmware.
- Firmware update failure: Confirm the SD card is properly formatted and contains the correct firmware file. Try updating via DFU mode if standard SD card update fails.
- Temperature sensor errors: Check sensor wiring and ensure the correct pull-up resistance value is selected via jumpers, especially for PT1000 sensors.
- Fan not working: Verify fan connections and ensure the selected fan voltage (5V, 12V, or 24V) matches the fan's requirements.
8. Specifications
| Feature | Specification |
|---|---|
| Product Size | 109.7*98mm |
| Installation Size | 102*76mm |
| Microprocessor | ARM Cortex-M7 STM32H743VIT6 / STM32H723VGT6 |
| EEPROM | 24C32 32Kbit |
| Input Voltage | DC12V-DC24V |
| Motor Voltage | DC12V-DC48V |
| Logic Voltage | DC 3.3V |
| Heating Interface | Heated bed (HB), heater cartridge (E0, E1) |
| Max Output Current (Heated Bed) | 10A, peak 11A |
| Max Output Current (Heater Cartridge) | 5.5A, peak 6A |
| Fan Interface | 3 CNC fans, 3 normally open fans, optional voltage of CNC fans |
| Max Output Current (Fan Interface) | 1A, peak 1.5A |
| Total Current (Heater + Driver + Fan) | Less than 10A |
| WIFI Interface | ESP-12S, ESP-07S, ESP32 |
| Expansion Interface | BLTouch (Servos, Probe), PS-ON, PWR-DET, Fil-DET, RGB, CAN FD |
| Motor Drive Support | EZ5160/2209/2225/2226/2208/2130, TMC5160/2209/2225/2226/2208/2130, ST820, LV8729, DRV8825, A4988, etc. |
| Driver Working Mode Support | SPI, UART, STEP/DIR |
| Motor Drive Interface | X, Y, Z (dual Z axis), E0, E1 (total of 5) |
| Temperature Sensor Interface | 1 100K NTC, 2 100K NTC and PT1000 optional |
| Display Support | Serial touch screen, SPI touch screen, LCD display |
| PC Communication Interface | Square USB A (easy to plug and unplug) |
| Supported File Formats | G-code |
| Supported Machine Structures | Cartesian, Delta, Kossel, Ultimaker, CoreXY |
| Recommended Software | Cura, Simplify3D, Pronterface, Repetier-host, Makerware |
Detailed size diagram of the SKR 3 EZ V1.0 motherboard with dimensions.
9. User Tips
- Always double-check all wiring against the provided diagram before powering on the motherboard to prevent damage.
- When installing drivers, ensure they are seated correctly and firmly in their sockets. The pinless design of EZ drivers simplifies this process.
- For optimal performance, ensure your firmware is up-to-date and correctly configured for your specific printer setup and chosen drivers.
- Utilize the selectable motor voltage feature to match your stepper motors' requirements for improved performance and reduced heat.
10. Warranty and Support
BIGTREETECH products are covered by a manufacturer's warranty against defects in materials and workmanship. For detailed warranty information, technical support, or service inquiries, please refer to the official BIGTREETECH website or contact their customer support directly. Keep your proof of purchase for warranty claims.
