Introduction

1. Product Introduction

FLY SHT36 V3 is a toolhead board designed by Guangzhou Meilun Electronic Technology Co., Ltd. for 3D printer extruder heads. With this toolhead board, four wires can be used to replace the complicated wiring between the original mainboard and the printhead, optimizing the layout. SHT36 V3 is suitable for 36 stepper motors, and it integrates a CAN transceiver, RS232 transceiver, Type-C port, TMC2209 driver, LIS2DW accelerometer, 2 controllable fans, and other functions into a toolhead board. This toolhead board is suitable for Klipper firmware, and Max V3 supports RRF firmware.

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1.1 Product Features

• Reserved Boot button; users can enter Boot mode via Type-C to update firmware
• Supports Klipper firmware; Max V3 supports RRF firmware
• Supports CAN mode and RS232 mode; Max V3 supports RRF CAN mode
• In RS232 mode, it offers higher transmission rates and greater stability. In CAN mode, it supports CAN expansion with a reserved CAN expansion interface
• Temperature sensor support: Plus V3 and Max V3 have an onboard MAX31865 chip, compatible with PT100 and PT1000 temperature sensors.
• Supports two controllable fans with selectable voltage; the Mos small board is replaceable for easy maintenance and replacement, with a maximum output current of up to 1A
• Onboard LIS2DW accelerometer; Max V3 has an onboard 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 and RS232 mode; Max V3 supports RRF CAN mode
• Added RS232 mode, featuring higher transmission rates, stronger stability, and simpler debugging
• Max V3 adds RRF CAN mode, which can be switched to an RRF tool board for enhanced applicability
• Added CAN expansion interface for easy expansion of CAN devices
• Added terminal resistor DIP switch; its 120R terminal resistor can be selected via DIP switch without jumper wires
• Added 1-meter power/signal connection cable; the cable uses a twisted-pair design for stronger anti-interference performance

1.3 Product Parameters

• MCU: Raspberry Pi rp2040, Dual core ARM Cortex-M0+@133MHz
• The connection interface uses an XT30(2+2) connector, supporting 15A current and 30A peak
• Firmware: Reprap/Klipper
• Input voltage: DC12V-24V
• Logic voltage: DC3.3V
• Onboard sensors: LIS2DW, Max V3 onboard LDC1612
• Heater interface: Heater (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 sensor: One 100K NTC or PT1000 (TH0), one PT100/PT1000 selectable

2. 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
Heater Port	5A	2.5A
Fan Port	1A	0.5A