Introduction

1. Product Overview

FLY SB2040 V3 is a tool board designed by Guangzhou Meilun Electronics Technology Co., Ltd. for the VORON Stealthburner print head. With this tool board, four wires can replace the complicated wiring between the main board and the print head, optimizing the layout. SB2040 is applicable to stealthburner and afterburner. It integrates a CAN transceiver, RS232 transceiver, USB port, TMC2209 driver, LIS2DW accelerometer, three controllable fans, and other functions. This tool board supports Klipper and RRF firmware.

1.1 Product Features

• A Boot button is reserved, allowing users to update firmware by entering Boot mode via Type-C
• Supports Klipper firmware and RRF firmware
• Supports CAN mode, RS232 mode, and RRF CAN mode
• In RS232 mode, it offers higher transmission speed and stronger stability. In CAN mode, it supports CAN expansion with a reserved CAN expansion interface
• Temperature sensor support: onboard MAX31865 chip, compatible with PT100 and PT1000 temperature sensors
• Onboard LIS2DW accelerometer and LDC1612 sensor
• RGB interface is reserved; onboard 2209 driver supports various leveling sensors, such as Klicky, Voron Tap, PL08n, etc.
• Supports 12-24V voltage and 15A current input; enlarged heating cartridge port with a rated current of 10A

1.2 New Features

• Supports switching between Klipper CAN mode, RS232 mode, and RRFCAN mode
• Added RS232 mode, which provides higher transmission speed and stronger stability, making debugging easier
• Added RRF CAN mode, enabling switching to RRF tool board and enhancing versatility
• Added CAN expansion interface for easy expansion of CAN devices
• Added terminal resistor DIP switch; the 120R terminal resistor can be selected via DIP switch without jumper wires
• Added 1m power/signal cable; the cable uses twisted pair design for stronger anti-interference performance

1.3 Product Specifications

• MCU: Raspberry Pi rp2040, Dual core ARM Cortex-M0+ @133MHz
• Connection interface uses XT30(2+2) connector supporting 15A current, peak 30A
• Firmware: Reprap/Klipper
• Input voltage: DC12V-24V
• Logic voltage: DC3.3V
• Onboard sensors: LIS2DW, optional ldc1612 and max31865
• Heating cartridge interface: Heating cartridge (HEAT0)
• Expansion interfaces: RGB, EndStop, PT100/PT1000, XH2.54-2P CAN port
• Fan interfaces: one DC fan, two DC fans or PWM fans
• Motor driver: onboard TMC2209
• Temperature sensors: one 100K NTC or PT1000 (TH0), one PT100/PT1000 optional

4. Product Classification

RRF tutorial link RRF

SB2040	V3	Plus V3	Max V3	Pro V3	Pro Plus V3	Pro Max V3
Drive
Klipper CANBus	✅	✅	✅	✅	✅	✅
Klipper RS232	✅	✅	✅	✅	✅	✅
RRF CANBus	❌	❌	✅	❌	❌	✅
LIS2DW	✅	✅	✅	✅	✅	✅
MAX31865	❌	✅	✅	❌	✅	✅
LDC1612	❌	❌	✅	❌	❌	✅

Product Notes

Output Port	Maximum Current at 24V	Maximum Current at 12V
Heater Port	5A	2.5A
Fan Port	1A	0.5A