Klipper Homing Timeout Issue

Prompt

This prompt applies to all commands on this page

If you receive an error message like sed: can't read ~/klipper/klippy/mcu.py: No such file or directory after executing a command
Or any similar file not found errors (No such file or directory)
Please confirm that Klipper is installed and the current user is the user who installed Klipper.

Error Message: Error during homing z: Communication timeout during homing
The homing timeout issue mostly occurs during the Z-axis homing process in multi-mcu setups (X, Y also occur, but with lower probability).
The reason is that Klipper has extremely strict real-time requirements. If Klipper does not receive a correct response from the mcu within 0.025 seconds, it will consider the homing as a timeout.

The 0.025 seconds in the Klipper code is too stringent and can be appropriately increased to solve the homing timeout issue.
Execute the following command to directly modify the timeout time in the Klipper code to 0.05 seconds.
```
sed -i 's/TRSYNC_TIMEOUT = [0-9.]*$/TRSYNC_TIMEOUT = 0.05/' ~/klipper/klippy/mcu.py
```
- If there is no output after executing the command, it means the modification was successful.
After successfully modifying, you need to restart the Klipper service for the changes to take effect.
```
sudo systemctl restart klipper
```
- If there is no output after executing the command, it means the restart was successful.

To view the timeout time in the Klipper code, execute the following command.
```
grep "TRSYNC_TIMEOUT =" ~/klipper/klippy/mcu.py
```
- It will normally output the following content (if the timeout time has been modified, it will output the modified time).
```
TRSYNC_TIMEOUT = 0.025
```
To revert the modified code, execute the following command.
```
sed -i 's/TRSYNC_TIMEOUT = [0-9.]*$/TRSYNC_TIMEOUT = 0.025/' ~/klipper/klippy/mcu.py
```
- If there is no output after executing the command, it means the modification was successful.