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Motherboard FAQ

Host Connection Instructions​

Core Connection Limitation

The Fly-D7 motherboard must establish Klipper communication with the host computer via its Type-C USB port.

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Connection Requirements:

  • Use a high-quality Type-C data cable to ensure data transmission stability.
  • It is recommended that the cable length does not exceed 1.5 meters; avoid using excessively long cables.
  • 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 the D7 motherboard​

Troubleshooting Steps:

  1. Check the physical connection: Confirm that you are using the motherboard's Type-C port for connection.
  2. Confirm firmware status: Check if the motherboard has been correctly flashed with the Klipper firmware.

Issue 2: Host computer experiences intermittent reboots or communication abnormalities​

Problem Phenomenon If the Fly-D7 motherboard is used as the power source for the host computer (e.g., Raspberry Pi), it may cause the host computer to experience:

  • Intermittent, unexplained reboots
  • Unexpected communication interruptions with the motherboard
  • 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 computer is independently powered: The Raspberry Pi or other host computer must be connected to its original or dedicated power adapter.
  2. Do not power via the motherboard: Strictly prohibit connecting the motherboard's 5V pin to the host computer's 5V power pin to supply power.

Please check your wiring to ensure that the host computer and motherboard 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 sure to confirm the wire sequence is correct.
  • If you are unsure about the wiring method, do not connect the motherboard's 5V pin to avoid causing a short circuit or device damage.

Standard Three-Wire Endstop Interface Definition:

  1. Signal (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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