FLY-D8 Mainboard Introduction

The 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

The FLY-D8 is a main control board based on the high-performance STM32F407 ARM Cortex-M4 core, 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.

Key Features

• Core Performance: Utilizes 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 endstops, 4 heaters and thermistors, and 2 RGB light strips, providing high expandability.
• Reliable Connectivity: Supports CAN bus and RS232 communication for stable data transmission with low latency.
• Safety Protection:
  • Power input features reverse polarity protection.
  • The 5V supply for endstop and other interfaces uses an isolated design; it does not output when the main power is not connected, preventing damage from misoperation.
• 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 physically switched to an RS232 interface via a switch, adapting to various external devices.

Technical Specifications

Item	Description
Main Control Chip	STM32F407VGT6 (ARM Cortex-M4 @ 168MHz)
Supported Firmware	Marlin 2.0 / Klipper
Driver Support	8 channels, compatible with A4988, LV8729, DRV8225, TMC2208/2209/5160 (UART/SPI), etc.
Display Interfaces	Serial touchscreen, mini12864 LCD, 12864 LCD, 2004 LCD, FLY 4.3/7.0 V1
Probe Support	Auto-leveling sensors like BLTouch, PL08N, Klicky, Voron Tap, etc.
Input Voltage	DC 12V or 24V
Temperature Detection	4 independent thermistor interfaces
Heater Output	4 channels (1 heated bed + 3 extruder heaters)
Other Interfaces	6 endstop interfaces, 2 RGB interfaces, CAN bus interface, USB/RS232 switchable interface

Interfaces and Connections

• Power: Uses reverse polarity 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 Port	Max Current at 24V Power	Max Current at 12V Power
Heated Bed Port	10A	5A
Heater Cartridge Port	6A	3A
Fan Port	1A	0.5A

• Ensure the power supply voltage and current meet the above requirements to avoid overload.
• Before connecting the power supply, double-check the polarity to prevent reverse connection.