Introduction

1. Product Introduction

The FLY SHT36 V3 is a hotend tool board designed for 3D printer extruders by Guangzhou Magnesium Wheel Electronics Technology Co., Ltd. Using this tool board, four wires can replace the complex wiring between the mainboard and the print head, optimizing the layout. The SHT36 V3 is suitable for 36 stepper motors and integrates a CAN transceiver, RS232 transceiver, Type-C port, TMC2209 driver, LIS2DW accelerometer, two controllable fans, and other functions. This tool board is compatible with Klipper and RRF firmware.

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1.1 Product Features

• Reserved Boot button, allowing users to enter Boot mode via Type-C to update firmware
• Supports Klipper firmware and RRF firmware
• Supports CAN mode, RS232 mode, and RRF CAN mode
• In RS232 mode, it offers higher transmission rates 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
• Supports two controllable fans with selectable voltage; replaceable Mos small board for easy maintenance and replacement, with a maximum output current of 1A
• Onboard LIS2DW accelerometer and LDC1612 sensor
• Reserved RGB interface; onboard 2209 driver supports various leveling sensors such as BLtouch, klicky, Voron Tap, PL08n, etc.
• Supports 12-24V voltage and 15A current input; enlarged heating rod port with a rated current of 10A

1.2 New Features

• Supports switching between Klipper CAN mode, RS232 mode, and RRF CAN mode
• Added RS232 mode with higher transmission rates, stronger stability, and simpler debugging
• Added RRF CAN mode, allowing switching to RRF tool board for enhanced applicability
• 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 jumpers
• Added 1-meter power/signal cable with twisted-pair design for stronger anti-interference performance

1.3 Product Parameters

• 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 and LDC1612
• Heating rod interface: Heating rod (HEAT0), 10A
• Expansion interfaces: RGB, EndStop, PT100/PT1000, XH2.54-2P CAN expansion port
• Fan interface: Two DC controllable fans
• Motor driver: Onboard TMC2209
• Temperature sensors: One 100K NTC or PT1000 (TH0), one optional PT100/PT1000

4. Product Classification

RRF tutorial link RRF

SHT36 V3	V3	Plus V3	Max V3
Klipper CANBus	✅	✅	✅
Klipper RS232	✅	✅	✅
RRF CANBus	❌	❌	✅
LIS2DW	✅	✅	✅
MAX31865	❌	✅	✅
LDC1612	❌	❌	✅

Product Notes

Output Port	Max Current at 24V Power	Max Current at 12V Power
Heating Port	5A	2.5A
Fan Port	1A	0.5A