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Introduction

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1. Product Introduction

FLY SHT36 V3 is a nozzle tool board designed by Guangzhou Meilun Electronic Technology Co., Ltd. for 3D printer extrusion heads. Using this tool board, four wires can replace the complicated wiring between the original motherboard and the print head, optimizing the layout. SHT36 V3 is suitable for 36-step stepper motors and integrates a CAN transceiver, RS232 transceiver, Type-C port, TMC2209 driver, LIS2DW accelerometer, two controllable fans, and other features. This tool board is compatible with Klipper and RRF firmware.

1.1 Product Features​

  • Reserved Boot button, users can enter Boot mode to update firmware via Type-C
  • Supports Klipper firmware, RRF firmware
  • Supports CAN mode, RS232 mode, RRF CAN mode
  • In RS232 mode, it has a higher transmission rate and stronger stability. In CAN mode, it supports CAN expansion and reserves CAN expansion interface
  • Temperature sensor support: On-board MAX31865 chip, compatible with PT100 and PT1000 temperature sensors.
  • Supports two controllable fans, voltage selectable, replaceable Mos小板，便于维修替换，最大输出电流可达1A
  • On-board LIS2DW accelerometer and LDC1612 sensor
  • Reserved RGB interface, on-board 2209 driver, supports a variety of leveling sensors, such as BLtouch, klicky, Voron Tap, PL08n, etc.
  • Supports 12-24V voltage, 15A current input, enlarged heating rod port, rated current 10A

1.2 New Features​

  • Support Klipper CAN mode, RS232 mode, RRF CAN mode mutual switching
  • Added RS232 mode, which has a higher transmission rate and stronger stability, and is simpler to use for debugging
  • Added RRF CAN mode, can be switched to RRF tool board, enhanced applicability
  • Added CAN expansion interface, convenient for expanding CAN devices
  • Added terminal resistor DIP switch, its terminal resistor 120R can be selected by DIP switch, no need for jumpers
  • Added 1 meter power/signal cable, the cable uses twisted pair design, with 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 to support 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-way DC controllable fan
  • Motor driver: On-board TMC2209
  • Temperature sensor: One way 100K NTC or PT1000 (TH0), one way PT100/PT1000 optional

4. Product Classification

RRF tutorial linkRRF

SHT36 V3V3Plus V3Max V3
Klipper CANBus✅✅✅
Klipper RS232✅✅✅
RRF CANBus❌❌✅
LIS2DW✅✅✅
MAX31865❌✅✅
LDC1612❌❌✅