Important Notes

Notes

• This tutorial specifically covers the wiring and ID search for toolboards. The related steps are not applicable to mainboards. Please distinguish them carefully.
• If you are not using a toolboard, please ignore this tutorial.

Toolboard ID Reading and Viewing

• USB ID Acquisition
• CANBus UUID Acquisition

Precautions

Important Prerequisites

Before starting to search for the Tool Board ID, please ensure that all the following conditions are met:

• Firmware Preparation: The tool board has been flashed with USB firmware or is currently in USB flashing mode.
• Clear Objective: This tutorial is only for searching the Tool Board ID and is not applicable to the Main Board ID.
• Hardware Connection: The Tool Board is correctly connected to the host computer's USB-A port via USB.
• Login Method: Please log in to the host computer via SSH over the network to perform operations. Do not use serial port login.

Search for USB ID

ls /dev/serial/by-id/*

• Normal Situation: The terminal will display an ID similar to the example below (the image below is for illustration only).
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• If no ID appears after entering the command above, but lsusb shows the device, please try a different host computer or change the host computer's operating system.

Note

If multiple IDs appear, please select the one corresponding to your main board's MCU model.

Fill the USB ID into the Configuration

For fluidd: {…}, click to enter and find printer.cfg. Loading...

For mainsail: Machine, click to enter and find printer.cfg. Loading...

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Note: All IDs appearing in this document are examples. The actual ID for each main board is different. Please modify and fill in based on the ID you actually obtained.

Fill in the Tool Board USB ID

• Below is a reference configuration.

  Note

  • toolboard in the configuration below refers to the tool board name. If it has a different name, please replace it with the corresponding name.
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  [mcu toolboard]
  serial: <Replace here with the ID you just queried>

  • When adding the Tool Board ID, it must be [mcu toolboard] followed by serial: and then the tool board ID you searched for.
  • Below is a reference configuration.
  • Please note this tutorial is for Tool Board ID search and configuration. Normally, the tool board should already be properly connected to the main board.
  • And the main board must be [mcu], while the tool board is [mcu toolboard].

  Reference for fluidd. Loading...

  Reference for mainsail. Loading...

  • Click the SAVE & RESTART button in the upper right corner. After clicking, Klipper will automatically save and restart.

• Please note that the toolboard power cable is not connected to the CAN port, but to the 12V-24V power line.

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• Please note that the 120Ω jumper must be connected.

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Complete Guide to CAN Toolboard Setup

Preparations

Important Prerequisites

• Toolboard Status: Ensure the toolboard is flashed with Klipper-can firmware or is in Katapult-can mode.
• Important Note: This tutorial is only for searching for Toolboard IDs. It is not applicable for searching for Mainboard IDs.
• Connection Requirement: The toolboard must be connected to one of the following devices:
  • A UTOC module
  • A mainboard flashed with USB-to-CAN Bridge firmware
• Final Connection: The aforementioned device must be connected to the host computer.

CAN Network Configuration Requirements

• Default Configuration: This tutorial assumes the CAN network is already configured on the host computer.
• Fly Users: If using a Fly host computer running the Fly-FAST system, CAN is configured by default (rate: 1Mbps).
• First-Time Users: Please be sure to read the tutorial below first: CAN Configuration Tutorial

Connect via SSH

• Log in to SSH over the network (Do not use serial port login).
• Ensure the host computer is properly connected to the CAN network device.

Search for CAN ID

• Search command for a standard host computer:

  ~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0

• Search command for a FLY host computer:

  python3 ~/klipper/scripts/canbus_query.py can0

Search Result Explanation

CANID

• Important Note: The mainboard ID has already been configured in Klipper in previous documentation. Under normal circumstances, the mainboard's CANID cannot be found in the search.
• Quick Verification Method: If confirmation is needed, first disconnect the CAN cable between the mainboard and the toolboard, then re-run the search.

• After executing the search command, the following situations may occur:

Result Display	Status Description	Next Steps
Application: Klipper	Device is flashed with Klipper firmware	This ID can be used directly.
Application: CANBOOT or Katapult	Device is in Bootloader mode	Klipper firmware needs to be flashed before use.
Total 0 uuids found	No devices found	Please check the following issues: 1. Is the CAN network configured correctly? 2. Is the CAN rate consistent? (Default: 1Mbps) 3. Is this ID already used in the configuration? (You need to comment it out, save, power off, and restart.)

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About Duplicate IDs

If a device ID is already configured in printer.cfg, it will not appear in the search results. To search for it again, please:

1. Comment out that device ID in the configuration file.
2. Save the configuration and restart Klipper.
3. Power off and restart all devices.

Configure CAN Device ID

1. Obtain the Configuration File

Locate the printer.cfg configuration file based on the web interface you are using:

Fluidd Click the {...} icon in the left navigation bar, then find printer.cfg. Loading...

Mainsail Click Machine in the top navigation bar, then find printer.cfg. Loading...

2. Add Device Configuration

Add the toolboard configuration to printer.cfg:

[mcu toolboard]
canbus_uuid: <Enter the queried ID here>

Configuration Note

• toolboard is the name of the toolboard. Please modify it according to your actual situation.
• For a mainboard ID, the configuration section should be [mcu].
• In a normal configuration, the mainboard uses [mcu], and toolboards use [mcu toolboard].

3. Save and Restart

1. Click the SAVE & RESTART button in the upper right corner.
2. The system will automatically save the configuration and restart Klipper.

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Note

All IDs appearing in this document are examples. The actual ID for each mainboard/toolboard is different. Please modify and fill in based on the ID you actually obtain.