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Mainboard FAQ

Host Computer Connection Instructions​

Core Connection Limitation

The Fly-D7 mainboard 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 & Troubleshooting​

Issue 1: Host Computer Cannot Recognize D7 Mainboard​

Troubleshooting Steps:

  1. Check Physical Connection: Confirm that you are using the Type-C port on the mainboard for connection.
  2. Confirm Firmware Status: Verify that the Klipper firmware has been correctly flashed onto the mainboard.

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

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

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

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 receive stable and sufficient current.

You Must Ensure:

  1. Host Computer Has Independent Power: Host computers like the Raspberry Pi must be connected to their original or dedicated power adapter.
  2. Do Not Power via the Mainboard: Strictly prohibit connecting the 5V pins of the mainboard to the 5V power pins of the host computer to power it.

Please Check your wiring to ensure that only the USB data cable connects the host computer and the mainboard, and that no additional power wires exist.

Endstop Wiring Instructions​

Wiring Precautions
  • Three-wire endstops are extremely easy to wire incorrectly; please double-check that the wire sequence 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 (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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