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Klipper Homing Timeout Issue

Problem Description​

A communication timeout error occurs during the homing process:

Error during homing z: Communication timeout during homing

This issue is common in multi-MCU Z-axis homing scenarios. If the host has a high load during homing, or if multi-MCU communication responses are unstable, a timeout may be triggered.

Prerequisites
  • Confirm that Klipper is properly installed and can start.
  • Confirm that the current user is the Klipper installation user.
  • Confirm that the paths in the commands below match the actual system paths.
  • It is recommended to back up relevant files before modifying Klipper source code or adding scripts.

Method 1: Adjust Timeout​

Note

This method directly modifies the Klipper source file mcu.py and is only recommended for confirming homing timeout issues. The modification may be overwritten after updating Klipper; it is recommended to restore the default values after the issue is resolved or verified.

First, back up the original file:

cp ~/klipper/klippy/mcu.py ~/klipper/klippy/mcu.py.bak

Modify TRSYNC_TIMEOUT in Klipper:

sed -i 's/TRSYNC_TIMEOUT = [0-9.]*$/TRSYNC_TIMEOUT = 0.05/' ~/klipper/klippy/mcu.py

Restart the Klipper service:

sudo systemctl restart klipper

Check the current setting:

grep "TRSYNC_TIMEOUT =" ~/klipper/klippy/mcu.py

To restore the default value:

sed -i 's/TRSYNC_TIMEOUT = [0-9.]*$/TRSYNC_TIMEOUT = 0.025/' ~/klipper/klippy/mcu.py
sudo systemctl restart klipper

To restore from the backup file:

cp ~/klipper/klippy/mcu.py.bak ~/klipper/klippy/mcu.py
sudo systemctl restart klipper
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