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FLY-D8 Mainboard Introduction

Note
  • This document is still being updated.
Note
  • This document is still being updated.

Mellow Fly-D8 is a high-performance 3D printer control mainboard developed by the Fly3D mainboard R&D team of Guangzhou Mellow Electronic Technology Co., Ltd. It supports up to 8 stepper motor drivers.

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Product Overview​

FLY-D8 is a main control board based on the high-performance ARM Cortex-M4 core of the STM32F407, specifically designed for multi-axis, high-precision 3D printers. The board features rich interfaces, comprehensive protection functions, and good expandability. It supports Marlin 2.0 and Klipper firmware, making it suitable for DIY upgrades or next-generation printer development.

Main Features​

  • Core Performance: Uses the STM32F407VGT6 chip with a 32-bit ARM Cortex-M4 core running at 168MHz, offering strong computing power.
  • Rich Interfaces: Supports 8 motor drivers, 6 limit switches, 4 heating and thermistor channels, 2 RGB light strips, providing strong expandability.
  • Reliable Connectivity: Supports CAN bus and RS232 communication for stable data transmission with low latency.
  • Safety Protection:
    • Power input features reverse connection protection.
    • The 5V supply for interfaces like limit switches uses an isolated design; it does not output when the main power is not connected, preventing damage from incorrect operations.
  • Convenient Debugging: Onboard BOOT and RESET buttons allow easy entry into DFU mode via USB for firmware flashing.
  • Dual USB Design: Provides two USB 2.0 interfaces. One can be switched to an RS232 interface via a physical switch, adapting to various external devices.

Technical Specifications​

ItemDescription
Main Control ChipSTM32F407VGT6 (ARM Cortex-M4 @ 168MHz)
Supported FirmwareMarlin 2.0 / Klipper
Driver Support8 channels, compatible with A4988, LV8729, DRV8225, TMC2208/2209/5160 (UART/SPI), etc.
Display InterfaceSerial touch screen, mini12864 LCD, 12864 LCD, 2004 LCD, FLY 4.3/7.0 V1
Probe SupportBLTouch, PL08N, Klicky, Voron Tap, and other auto-leveling sensors
Input VoltageDC 12V or 24V
Temperature Detection4 independent thermistor interfaces
Heating Output4 channels (1 for heated bed + 3 for extruder heaters)
Other Interfaces6 limit switch interfaces, 2 RGB interfaces, CAN bus interface, USB/RS232 switch interface

Interfaces and Connections​

  • Power: Uses reverse-connection protection terminals, supports 12V/24V input.
  • Motor Drivers: 8 independent driver slots supporting various stepper driver modules.
  • Communication: Supports USB, CAN, and RS232, allowing flexible configuration as needed.

Precautions​

Output PortMaximum Current at 24V PowerMaximum Current at 12V Power
Heated Bed Port10A5A
Heater Cartridge Port6A3A
Fan Port1A0.5A
  • Ensure the power supply voltage and current meet the above requirements to avoid overload.
  • Before connecting the power, double-check the polarity to prevent reverse connection.
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