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FLY-D7 Mainboard Introduction

The Mellow Fly-D7 is a high-performance 3D printer mainboard developed by the Fly3D mainboard R&D team of Guangzhou Mellow Electronic Technology Co., Ltd. It supports up to 7 stepper motors.

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Important Notes
  1. Firmware Support: This mainboard supports Klipper and Marlin firmware. If using Klipper firmware, it requires a companion computer (host).
  2. Power Supply Note: The D7 mainboard does not support reverse powering a companion computer (host) through its interfaces.

Product Features​

  • Main Control Chip: Utilizes the 32-bit ARM Cortex-M0+ architecture STM32F072RBT6 chip with a 48MHz clock speed.
  • Communication Bus: Supports CAN bus connection, offering advantages like stable data transmission, low latency, and reliable connectivity.
  • Driver Compatibility: Supports various stepper motor drivers including A4988, LV8729, DRV8225, TMC2208/2209/5160, and more.
  • Smart Endstop: Onboard DIAG function pins allow easy implementation of sensorless homing without physical limit switches by using a jumper cap.
  • Rich Interfaces: Provides various expansion interfaces such as BLTouch (servo and probe), LCD screen, and more.
  • Flexible Power Supply: Supports 12-24V wide-range DC input, ensuring stable power supply and eliminating the need for additional step-down modules.

Product Specifications​

  • MCU: STM32F072RBT6
  • Firmware: Klipper/Marlin
  • Supports 12-24V DC power supply for more stable operation, eliminating step-down modules
  • Driver Operating Mode Support: SPI, UART, STEP/DIR
  • Supported Drivers: Supports external TMC5160Pro, TMC5160, TMC2209, TMC2225, TMC2226, TMC2208, TMC2130, A4988, etc.
  • Expansion Interfaces: BLTouch (Servos, Probe), UART X1
  • Heater Interfaces: 3 controllable interfaces supporting 10A
  • Fan Interfaces:
    • 2 controllable 2-wire fan ports
    • 2 parallel fan ports
    • 2 always-on fan ports
  • Supported Printer Structures: Cartesian, Delta, Kossel, Ultimaker, CoreXY, etc.

Electrical Specifications (Maximum Continuous Current)​

Output PortMax Current @ 24VMax Current @ 12V
Heater Cartridge Port6A3A
Fan Port1A0.5A
  • 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.
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