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

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Product Overview​

The Gemini V2 is a highly integrated all-in-one control solution with an onboard host computer. Its built-in high-performance computing core can directly replace standalone hosts like the Raspberry Pi. It integrates 1GB of DDR3 memory and features an enhanced 5V power protection design, significantly improving system reliability and stability.

Storage Device Notice

The Gemini series does not include a storage device by default. You 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 speeds and higher reliability.
  2. Alternative Option: Use a Micro SD (TF) card with a capacity between 16GB and 128GB.

Core Features​

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

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 (private protocol) for expanding 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 Port × 1 (dedicated for host cooling)

Lower-Level Control (MCU)​

  • Main Controller: STM32F405
  • Motor Drivers: Supports 4 high-voltage motor driver positions.
  • Power Input: Supports DC 12-24V wide voltage input, providing stable power without the need for an additional buck converter.
  • Expansion Interface: Reserved CAN bus expansion interface.

Important Parameters & Safety Notes​

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 devices and ensure the power supply has sufficient capacity.

Output PortMax Current at 24V SupplyMax Current at 12V Supply
Heated Bed Port15 A7.5 A
Hotend Heater Port6 A3 A
Fan Port1 A0.5 A

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

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