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Mainboard FAQ

Host Connection Instructions​

Core Connection Restriction

The Fly-D7 mainboard must establish Klipper communication with the host 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 data cable length does not exceed 1.5 meters; avoid using excessively long cables.
  • Connect the other end of the data cable to a standard USB-A port on the host.

Common Issues and Troubleshooting​

Issue 1: Host Cannot Recognize D7 Mainboard​

Troubleshooting Steps:

  1. Check Physical Connection: Ensure you are using the Type-C interface on the mainboard for connection.
  2. Confirm Firmware: Check if the mainboard has been correctly flashed with Klipper firmware.

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 supply pins of the host (such as a Raspberry Pi). This connection method will cause a power conflict.

Important Warning

  • Such connections are strictly forbidden, as they may damage the USB interface or power circuitry of the mainboard or host.
  • Communication between the mainboard and the host 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 other than the USB data cable.
  2. Ensure the host (e.g., Raspberry Pi) is powered by its own independent power adapter.
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