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Mainboard FAQ

Host Connection Instructions​

Core Connection Restriction

The Fly-D5 mainboard must and can only establish Klipper communication with the host computer through its onboard Type-C USB interface.

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Connection Requirements:

  • Use a high-quality Type-C data cable to ensure stable data transmission.
  • It is recommended that the cable length does not exceed 1.5 meters to avoid signal attenuation due to excessive cable length.
  • Please connect the other end of the data cable to a standard USB-A port on the host computer.

Common Issues and Troubleshooting​

Issue 1: Host Computer Cannot Recognize D5 Mainboard​

Troubleshooting Steps:

  1. Check Physical Connection: Confirm that the connection is made using the mainboard's Type-C interface.
  2. Confirm Firmware Status: Check if the mainboard has been correctly flashed with the Klipper firmware.

Issue 2: Host Computer Experiences Intermittent Reboots or Communication Abnormalities​

Problem Phenomenon If the Fly-D5 mainboard is used as the power source for a host computer (e.g., Raspberry Pi), it may cause the host to experience:

  • Intermittent, unexplained reboots
  • Unexpected communication interruptions with the mainboard
  • Abnormal USB device recognition
  • Klipper service unexpectedly stopping

Root Cause and Solution The root cause of this issue is an incorrect power supply method. The host computer must be powered by its independent power adapter to obtain stable and sufficient current.

You Must Ensure:

  1. Host Independent Power Supply: Host computers like the Raspberry Pi must be connected to their original or dedicated power adapters.
  2. Prohibit Powering via Mainboard: It is strictly forbidden to power the host by connecting the mainboard's 5V pin to the host's 5V power pin.

Please Check your wiring to ensure that the host computer and the mainboard are connected only via the USB data cable, with no additional power supply wires present.

Endstop Wiring Instructions​

Wiring Precautions
  • Three-wire endstop switches are extremely easy to wire incorrectly. Please be absolutely certain the wire order is correct.
  • If you are unsure about the wiring method, do not connect the mainboard's 5V pin to avoid short circuits or device damage.

Standard Three-Wire Endstop Interface Definition:

  1. Signal
  2. GND (Ground)
  3. 5V (Power)

For more detailed wiring methods and configuration, please refer to: Various Endstop Wiring Instructions

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