Mellow FLY-SB2040 V3 Toolhead Board – Voron Klipper CAN Bus

Mellow FLY-SB2040 V3 CAN Bus Toolhead Board for Voron 2.4 R2 / Trident / Stealthburner CW2

Upgrade your Voron 3D printer's toolhead with the Mellow FLY-SB2040 V3 — a purpose-built toolhead controller board designed for the Voron 2.4 R2, Trident, and Stealthburner CW2 extruder systems. Featuring CAN bus, RS232, and USB communication, onboard TMC2209/TMC2240 stepper drivers, and support for both Klipper and RepRapFirmware (RRF), this board streamlines your wiring harness while delivering rock-solid, low-latency data transmission.

Made in Mainland China.

Key Features

• Multi-Protocol Communication: Supports CAN bus, RS232, and USB for stable, low-latency data transfer over longer distances — significantly reducing disconnections.
• Onboard TMC2209 / TMC2240 Drivers: Integrated stepper drivers for the extruder motor — no separate driver modules needed.
• Klipper & RRF Compatible: Easily toggle between RepRapFirmware and Klipper CAN, or between Klipper CAN and RS232, via dedicated onboard switches.
• LIS2DW Accelerometer: Built-in accelerometer with INT1/INT2 pins connected to the MCU for user-level input shaping calibration.
• PT100 & PT1000 Sensor Support: Switchable 4.7K / 1K pull-up resistors accommodate both standard NTC thermistors and high-accuracy PT1000 sensors. MAX31865 version adds dedicated PT100/PT1000 interface.
• High-Current Connectors: Upgraded connectors rated at 15A continuous (30A peak) replace older MX3.0 terminals for improved reliability.
• 8-Bit DIP Switch Configuration: Tool-free setup — no jumpers or soldering required for common configuration changes.
• DC & PWM Fan Support: Fan board switch toggles between DC and PWM fan modes for maximum flexibility.
• CAN Expansion Port: Additional CAN interface allows connection of further CAN-enabled expansion modules.
• 3m CAN Connection Cable Included: Pre-assembled cable prevents signal loss from improper terminal crimping.
• Max Version: Adds 1612 chip for high-speed RRF scanning.
• 5A Heater Port: Dedicated, rated heating rod output for safe hotend control.

Peripheral Interfaces

• USB × 1
• CAN / RS232 × 1
• Fan outputs × 3
• RGB × 1
• Probe × 1
• End Stop × 2
• Temperature Sensor × 1
• Heater × 1

Package Contents

SET 1: SB2040 V3 Board + 3m CAN Connection Cable

SET 2: SB2040 Plus V3 Board (with MAX31865 for PT100/PT1000) + 3m CAN Connection Cable

Compatibility

• Voron 2.4 R2 / Trident
• Stealthburner CW2 Extruder
• Gemini V1 / V1.1 / V2
• FLY-C8
• Raspberry Pi & other Linux-capable hosts

Technical Specifications

⚠️ Note: Do not enable HDMI output on the host when using this board — it may cause firmware errors. On Gemini V1/V1.1 mainboards, avoid running KlipperScreen simultaneously with CAN bus due to memory constraints. Gemini V2 supports both at the same time.

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Learn more: OSHA guidance on hand and power tools

Frequently Asked Questions

Q: What firmware does the Mellow FLY-SB2040 V3 board support?

A: The FLY-SB2040 V3 supports both Klipper and RepRapFirmware (RRF). Onboard switches let you toggle between RRF and Klipper CAN mode, or between Klipper CAN and RS232 mode, without any hardware modification.

Q: What is the difference between SET 1 and SET 2?

A: SET 1 includes the standard SB2040 V3 board, which supports NTC thermistors and PT1000 sensors via switchable pull-up resistors. SET 2 includes the SB2040 Plus V3 board, which adds a dedicated MAX31865 chip for more precise PT100 and PT1000 temperature sensor readings — ideal for high-temperature hotend setups.

Q: Which host computers is the FLY-SB2040 V3 compatible with?

A: The board is compatible with any Linux-capable host, including Raspberry Pi, FLY Gemini V1/V1.1/V2, and FLY-C8. It connects via USB-to-CAN (UTOC) or USB-to-RS232 (UTOR) adapter boards, making it easy to integrate with your existing printer setup.

Q: Does the SB2040 V3 require soldering for configuration?

A: No. The board features an 8-bit DIP switch for tool-free configuration, eliminating the need for jumpers or soldering for most setup tasks. This makes initial setup and firmware switching fast and straightforward.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.