BTT EBB42 CAN Adapter Board with MAX31865
Precision CAN Bus Toolhead Board for Advanced Klipper-Based 3D Printers
The BIGTREETECH EBB42 CAN Adapter Board is a compact extruder breakout board designed specifically for NEMA 17 (42-series) stepper motors. By moving essential electronics directly to the toolhead and utilizing CAN Bus or USB communication, the EBB42 dramatically reduces wiring complexity, improves signal reliability, and simplifies printer maintenance. Designed exclusively for Klipper firmware, it is an ideal upgrade for high-speed CoreXY, Voron, and custom FDM printers.
Integrated MAX31865 for Professional Temperature Monitoring
The onboard MAX31865 amplifier provides highly accurate temperature measurement for PT100 and PT1000 RTD sensors, supporting both 2-wire and 4-wire configurations. In addition, the board supports standard 100K NTC thermistors and selectable pull-up resistors, giving users flexibility for a wide range of hotend configurations.
This enhanced thermal monitoring ensures stable extrusion temperatures, improved print quality, and greater reliability when printing engineering-grade materials that require precise temperature control.
Simplified Wiring with CAN Bus Communication
The EBB42 supports both CAN Bus and USB Type-C communication, allowing users to significantly reduce cable clutter around the print head. CAN Bus provides long-distance communication, excellent noise immunity, and reliable data transmission, making it ideal for high-speed printers where cable management and signal integrity are critical.
The board also includes a selectable 120Ω CAN termination resistor and CAN expansion interfaces for easy integration into existing CAN networks.
Built for Reliability and DIY Flexibility
BIGTREETECH has equipped the EBB42 with numerous protection and expansion features, including:
- Reverse polarity protection on power input
- ESD protection on the USB Type-C interface
- Anti-flyback diodes on heater and fan outputs
- Thermistor protection circuitry to prevent MCU damage
- BOOT and RESET buttons for easy DFU firmware updates
- I2C expansion interface for filament monitoring and custom projects
- RGB, Probe, Endstop, and additional expansion connectors
Technical Specifications
| Specification | Details |
|---|---|
| Board Type | Extruder Breakout Board |
| Communication | CAN Bus / USB Type-C |
| Firmware Support | Klipper Only |
| Microcontroller | STM32F072C8T6 (ARM Cortex-M0, 48MHz) |
| Dimensions | 40 × 40 mm |
| Mounting Pattern | 31 × 31 mm, 4 × M3 holes |
| Input Voltage | DC 12V–24V |
| Maximum Input Current | 9A |
| Logic Voltage | 3.3V |
| Stepper Driver | Integrated TMC2209 |
| Driver Mode | UART |
| Supported Motor | NEMA 17 (42-series) |
| Heater Output | 1 × Heater (E0) |
| Max Heater Current | 5A |
| Fan Outputs | 2 × CNC Fans (FAN0, FAN1) |
| Fan Current | 1A Continuous, 1.5A Peak |
| USB Interface | USB Type-C |
| DCDC 5V Output | Up to 1A |
| Onboard Accelerometer | ADXL345 |
| Temperature Inputs | 100K NTC, PT1000, PT100 |
| RTD Amplifier | MAX31865 |
| Expansion Ports | Endstop, I2C, Probe, RGB, USB, CAN |
Included Features
- Integrated TMC2209 stepper driver
- Onboard ADXL345 accelerometer for resonance compensation
- MAX31865 RTD amplifier for PT100/PT1000 sensors
- USB Type-C connectivity
- CAN Bus communication support
- Firmware update via DFU mode
- Reverse polarity protection
- ESD protection circuitry
- CAN termination resistor selection
- DIY-friendly expansion interfaces
Important Notes
- Compatible with Klipper firmware only.
- HDMI should not be enabled, as it may cause communication errors.
- Verify CAN bus termination settings when configuring a CAN network.
- Ensure power polarity is correct before connecting the board.
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