Introduction

1. Product Overview

FLY SHT36 V3 is a nozzle toolboard designed by Guangzhou Meilun Electronics Technology Co., Ltd. for 3D printer extruders. With this toolboard, four wires can replace the complicated wiring between the mainboard and the print head, optimizing the layout. SHT36 V3 is applicable to 36 stepper motors and integrates a CAN transceiver, RS232 transceiver, TypeC port, TMC2209 driver, LIS2DW accelerometer, 2 controllable fans, and other functional components. This toolboard is compatible with Klipper and RRF firmware.

1.1 Product Features

• A Boot button is reserved, allowing users to update firmware via TypeC by entering Boot mode
• Supports Klipper firmware and RRF firmware
• Supports CAN mode, RS232 mode, and RRF CAN mode
• In RS232 mode, it provides 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
• Supports two controllable fans with selectable voltage, replaceable Mos small board for easier maintenance and replacement, maximum output current up to 1A
• Onboard LIS2DW accelerometer and LDC1612 sensor
• RGB interface reserved, onboard 2209 driver, supports multiple leveling sensors such as BLtouch, 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
• Newly added RS232 mode provides higher transmission speed and stronger stability, making debugging easier
• Newly added RRF CAN mode can switch to RRF toolboard, enhancing versatility
• Newly added CAN expansion interface for convenient expansion of CAN devices
• Newly added terminal resistor DIP switch, allowing selection of 120R terminal resistor via DIP switch without jumper wires
• Newly added 1-meter power/signal cable, with 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 and LDC1612
• Heating cartridge interface: Heating cartridge (HEAT0), 10A
• Expansion interfaces: RGB, EndStop, PT100/PT1000, XH2.54-2P CAN expansion port
• Fan interfaces: Two DC controllable fans
• Motor driver: onboard TMC2209
• Temperature sensors: One channel for 100K NTC or PT1000 (TH0), one channel optional for 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	Maximum Current at 24V	Maximum Current at 12V
Heater Port	5A	2.5A
Fan Port	1A	0.5A