Introduction

1. Product Introduction

FLY SHT36 V3 is a tool board designed for 3D printer extruders by Guangzhou Muleun Electronic Technology Co., Ltd. With this tool board, four wires can replace the complicated wiring between the mainboard and the print head, optimizing the layout. SHT36 V3 is suitable for 36-step motors, and it integrates a CAN transceiver, RS232 transceiver, TypeC port, TMC2209 driver, LIS2DW acceleration sensor, two controllable fans and other functions. This tool board is suitable for Klipper and RRF firmware.

1.1 Product Features

• Boot button is reserved, users can enter Boot mode via TypeC to update the firmware
• Supports Klipper firmware, RRF firmware
• Supports CAN mode, RS232 mode, RRF CAN mode,
• In RS232 mode, it has higher transmission rate, stronger stability. In CAN mode, it supports CAN expansion, and provides CAN expansion interface
• Temperature sensor support: On-board MAX31865 chip, compatible with PT100 and PT1000 temperature sensors.
• Supports two controllable fans, voltage selectable, can replace Mos small board, convenient for maintenance and replacement, maximum output current up to 1A
• On-board LIS2DW acceleration sensor and LDC1612 sensor
• Reserved RGB interface, on-board 2209 driver, supports various leveling sensors, such as BLtouch, klicky, Voron Tap, PL08n, etc.
• Supports 12-24V voltage, 15A current input, increased heating rod port, rated current 10A

1.2 New Features

• Supports switching between Klipper CAN mode, RS232 mode, RRF CAN mode
• Added RS232 mode, which has higher transmission rate, stronger stability, and simpler debugging
• Added RRF CAN mode, which can be switched to RRF tool board, enhancing versatility
• Added CAN expansion interface, convenient for expanding CAN devices
• Added terminal resistor switch, the terminal resistor 120R can be selected via switch, no need for jumper
• Added 1-meter power/signal cable, the cable uses twisted pair design, with 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
• On-board sensors: LIS2DW and LDC1612
• Heating rod interface: Heating rod (HEAT0), 10A
• Expansion interface: RGB, EndStop, PT100/PT1000, XH2.54-2P CAN expansion port
• Fan interface: Two DC controllable fans
• Motor driver: On-board TMC2209
• Temperature sensor: One 100K NTC or PT1000 (TH0), one PT100/PT1000 optional

4. Product Classification

RRF tutorial linkRRF

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