The BigTreeTech EBB 42 CAN v1.2 is a compact, feature-rich toolhead board designed to simplify wiring and enhance performance in 3D printers—especially those running Klipper firmware. Here’s a breakdown of its standout features:
🔧 Hardware & Connectivity
- CAN Bus & USB Communication: Offers both CAN and USB interfaces for flexible, simplified wiring.
- Microcontroller: Powered by an ARM Cortex-M0+ STM32G0B1CBT6 running at 64MHz.
- Onboard Stepper Driver: Integrated TMC2209 in UART mode for quiet, precise motor control.
- Accelerometer: Built-in ADXL345 for input shaping and vibration analysis.
🌡️ Thermal & Sensor Support
- Thermistor Compatibility: Supports 100K NTC, PT1000, and PT100/PT1000 via onboard MAX31865 (2-wire or 4-wire selectable).
- Protection Circuits:
- Thermistor protection to prevent MCU damage from heater leakage.
- Anti-flyback diodes on heater and fan ports.
- ESD protection on USB port.
- Reverse polarity protection on power input.
🛠️ Expansion & DIY Friendliness
- Interfaces: Endstop, I2C, Probe, RGB, CAN, USB, and PT100/PT1000.
- Firmware Updates: BOOT and RESET buttons for easy DFU mode flashing via USB.
- CAN Termination: Selectable 120Ω resistor via jumper cap.
- Power Options: USB jumper cap isolates USB 5V from main DC-DC circuit.
📐 Physical Specs
- Size: 40mm x 40mm with 31mm x 31mm mounting holes (M3).
- Voltage: 12V–24V input, 3.3V logic.
- Fan Outputs: Two fan ports (FAN0, FAN1), each rated for 1A (1.5A peak).
- Heater Output: Supports up to 5A for hotend.
