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Mainboard FAQ

Host Connection Instructions​

Core Connection Restriction

The Fly-D5 mainboard must establish Klipper communication with the host computer via its Type-C USB interface.

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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 D5 mainboard​

Troubleshooting Steps:

  1. Check Physical Connection: Ensure the connection is made using the Type-C interface on the mainboard.
  2. Confirm Firmware: Check if the Klipper firmware has been correctly flashed onto the mainboard.

Issue 2: Explanation of Mainboard Back-Powering the Host​

Cause of the Issue It is prohibited to connect the mainboard's 5V power pins (e.g., the 5V on the limit switch interface) to the 5V power pins of the host computer (such as a Raspberry Pi). This type of connection will cause a power conflict.

Important Warning

  • This type of connection is strictly forbidden, as it may damage the USB interface or power circuitry of either the mainboard or the host computer.
  • Communication between the mainboard and the host computer should only occur via the USB data cable; no other electrical connections should be established.

Correct Handling Method

  1. Check for and remove any 5V connection wires between the mainboard and the host computer, other than the USB data cable.
  2. Ensure the host computer (e.g., Raspberry Pi) is powered by its own independent power adapter.
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