Introduction

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 five stepper motors.

1. Product Features

• Uses 32-bit ARM Cortex-M0+ series STM32F072RBT6 main control chip with a main frequency of 48MHz
• Supports CAN bus connection for more stable data transmission, lower latency, and more reliable connectivity
• Driver support: A4988, LV8729, DRV8225, TMC2208/2209/5160, etc.
• Onboard DIAG function pin, supports endstop-free homing by simply plugging or removing a jumper cap

2. Product Specifications

• MCU: STM32F072RBT6
• Firmware: Klipper/Marlin
• Supports 12-24V DC power supply for more stable power delivery, eliminating the need for a voltage regulator module
• Driver operation modes supported: SPI, UART, STEP/DIR
• Supported drivers: Supports external TMC5160Pro, TMC5160, TMC2209, TMC2225, TMC2226, TMC2208, TMC2130, A4988, etc.
• Expansion interfaces: BLTouch (Servos, Probe), UART x1, 12864 x1
• Fans: Two controllable 2-wire fans, two parallel fans, two always-on fans
• Temperature sensors: 2 channels of NTC 100K
• Heater interfaces: 2 controllable interfaces supporting 10A
• Supported machine structures: Cartesian, Delta, Kossel, Ultimaker, CoreXY

Notes

Output Port	Maximum Current at 24V	Maximum Current at 12V
Heater Port	10A	3A
Fan Port	1A	0.5A