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FLY-D5 Motherboard Introduction

The Mellow Fly-D5 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 5 stepper motor drivers.

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Important Notes
  1. Firmware Support: This motherboard supports Klipper and Marlin firmware. When using Klipper firmware, a host computer is required.
  2. Power Supply Instructions: The D5 motherboard does not support reverse-powering the host computer through the interface.

Power Indicator Light Description: View D5 Power LED Description

Product Features​

  • Main Control Chip: Utilizes a STM32F072RBT6 chip based on a 32-bit ARM Cortex-M0+ architecture, with a main frequency of 48MHz.
  • Communication Bus: Supports CAN bus connectivity, offering advantages such as stable data transmission, low latency, and reliable connections.
  • Driver Compatibility: Compatible with a variety of stepper motor drivers including A4988, LV8729, DRV8225, TMC2208/2209/5160, and more.
  • Smart Endstop: Features onboard DIAG function pins, allowing for easy sensor homing without physical limit switches via jumper caps.
  • Rich Interfaces: Provides multiple expansion interfaces such as BLTouch (for servos and probes), UART, 12864 LCD screen (not supported under Marlin firmware), and more.
  • Flexible Power Supply: Supports a wide voltage DC input of 12-24V, ensuring stable power supply and eliminating the need for an additional voltage regulator module.

Product Specifications​

  • Main control MCU: STM32F072RBT6
  • Supported Firmware: Klipper, Marlin
  • Input Voltage: DC 12-24V
  • Driver Interface Mode: SPI, UART, STEP/DIR
  • Compatible Drives: TMC5160Pro, TMC5160, TMC2209, TMC2225, TMC2226, TMC2208, TMC2130, A4988, etc.
  • Temperature sensor: 2 NTC 100K thermistor interfaces
  • Heated Output: 2 MOS control interfaces, supporting high-current heater cartridges
  • Fan Headers:
    • 2 controllable two-wire fan ports
    • 2 parallel fan ports
    • 2 normally open fan ports
  • Supported Device Structure: Cartesian, Delta, Kossel, Ultimaker, CoreXY, etc.
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Electrical Specifications (Maximum Continuous Current)​

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