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Gemini V3 All-in-One 3D Printer Control Board

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Product Overview​

The Gemini V3 is a highly integrated all-in-one control solution with an embedded host computer. Its onboard high-performance computing core can directly replace standalone host computers such as the Raspberry Pi, and integrates 1GB of DDR3 memory. Combined with an enhanced 5V power protection design, it significantly improves system reliability and stability.

Storage Device Notice

Gemini series does not include storage devices by default. You will need to prepare one of the following storage media to install and run the system:

  1. Recommended option: Purchase the dedicated FLY M2WE module for faster system speed and higher reliability.
  2. Alternative option: Use a Micro SD (TF) card with a capacity between 16GB and 128GB.

Key Features​

  • All-in-One Design: Onboard Allwinner H5 host computer with 1GB integrated memory, eliminating the need for an additional Raspberry Pi and its connection, simplifying wiring and reducing costs.
  • Enhanced Reliability: Optimized 5V power circuit protection effectively reduces the risk of chip damage caused by voltage anomalies.
  • Ready to Use: The system image comes pre-installed with the complete Klipper software ecosystem (including Moonraker, Mainsail, KlipperScreen, etc.) and common plugins, eliminating complex configuration and greatly lowering the entry barrier for beginners (storage device required).

Detailed Specifications​

Host Computer System (SoC)​

  • Processor: Allwinner H5, Quad-core 64-bit Cortex-A53
  • Graphics: Hexa-core Mali 450 GPU
  • RAM: 1GB DDR3 (shared with GPU)
  • Storage Expansion:
    • Supports Micro SD cards up to 128GB.
    • Onboard M.2 interface (proprietary protocol) for dedicated Wi-Fi or eMMC storage modules (do not connect non-FLY official devices).
  • Peripheral Interfaces:
    • USB 2.0 × 3, USB OTG × 1
    • 10/100M Ethernet × 1
    • CAN bus × 1
    • Micro HDMI × 1
    • SPI × 2, UART × 2
    • 5V controllable fan interface × 1 (dedicated for host computer cooling)

Control Board (MCU)​

  • Main Controller: STM32F405
  • Motor Drivers: Supports 4 high-voltage motor driver positions
  • Power Input: Supports DC 12-24V wide voltage input, stable power supply, no additional buck module required.
  • Expansion Interface: Reserved CAN bus expansion interface.

Important Parameters and Safety Notices​

Port Output Current Capability​

The maximum output current for each port varies with the supply voltage (12V or 24V). Please strictly refer to the table below when configuring equipment and ensure sufficient power supply capacity.

Output PortMaximum Current at 24V SupplyMaximum Current at 12V Supply
Heated Bed Port15 A7.5 A
Heater Cartridge Port6 A3 A
Fan Port1 A0.5 A

Note: It is recommended to plan sufficient power headroom for loads approaching the current limit (especially the heated bed) and ensure secure wiring connections to avoid overload risks.

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