Introduction

Mellow Fly-D8 is a high-performance 3D printer motherboard developed by the Fly3D motherboard R&D team at Guangzhou Mellow Electronics Technology Co., Ltd., supporting up to 8 stepper motors.

Product Features

• The motherboard's endstop and other interfaces are isolated and protected with 5V power supply; no power will be output if the POWER supply is not connected
• Uses a 32-bit ARM Cortex-M4 series 168 MHz STM32F407 chip
• Supports CAN bus and RS232 connections, providing more stable data transmission, lower latency, and more reliable connections
• The motherboard includes BOOT and RESET buttons, allowing users to update firmware via USB in DFU mode
• The power interface features reverse polarity protection to prevent damage from incorrectly connected power cables during DIY assembly
• Provides two USB 2.0 interfaces, expanding connectivity options; one of the USB interfaces can be switched to an RS232 interface via a toggle switch to accommodate various device connection needs

Product Specifications

• Microcontroller: 32-bit ARM Cortex-M4 series 168 MHz STM32F407ZGT6 chip
• Firmware: Marlin 2.0/Klipper
• Driver modes supported: TMC: UART/SPI
• Eight drivers supported: A4988, LV8729, DRV8225, TMC2208/2209/5160, etc.
• Display: Serial touchscreen, mini12864 LCD, 12864 LCD, 2004 LCD, FLY 4.3/7.0 V1
• Supports automatic bed leveling sensors: BLTouch, PL08N proximity sensors, Klicky, Voron Tap, etc.
• Input voltage: Supports 12V/24V
• 6 endstop interfaces, enabling precise range limitation and position control
• 2 RGB interfaces for vibrant visual effects
• 3 heater cartridge interfaces for independent control of extruders and heated beds
• 4 thermistor interfaces, capable of monitoring up to four temperature groups simultaneously for precise temperature control
• USB interface: Supports two USB 2.0 interfaces, one of which can be switched to RS232 via a toggle switch
• Provides two USB 2.0 interfaces, expanding connectivity options; one of the USB interfaces can be switched to an RS232 interface via a toggle switch to accommodate various device connection needs

Notes

Output Port	Maximum Current at 24V	Maximum Current at 12V
Heated Bed Port	10A	5A
Heater Port	6A	3A
Fan Port	1A	0.5A