Timer too close when homing

Basic Information:

Printer Model: ender 3 pro
MCU / Printerboard:4.2.2
klippy.log
klippy (14).log (601.1 KB)

Fill out above information and in all cases attach your klippy.log file. Pasting your printer.cfg is not needed

Describe your issue: i can heat bed and nozzle but when it tries to home i get this error msg…

MCU ‘mcu’ shutdown: Timer too close
This often indicates the host computer is overloaded. Check
for other processes consuming excessive CPU time, high swap
usage, disk errors, overheating, unstable voltage, or
similar system problems on the host computer.
Once the underlying issue is corrected, use the
“FIRMWARE_RESTART” command to reset the firmware, reload the
config, and restart the host software.
Printer is shutdown

Take care that the printer does not home too fast.
The values of 50 for X and Y and 25 for Z are way too high.
Stick to the default values of Klipper (5.0 mm/s)

Also take care that the USB cable is good quality (ferrite beads etc) and as short as possible and away from EMI sources like the Ender LCD.

will try slower movements.
i do have two other identical printers running without errors.
slower movements = no change, still throwing timer error

Likely as the error message indicates: Your host is overloaded. Given that it is a 4 core processor, e.g. a RPI 3, then the spike at ~420% indicates that all cores are (over)loaded.
Check other processes, webcam etc.

i dont have any other processes that i know of. no camera.

Klipper alone runs on a RPi Zero, which has the computing power of a wooden stick. Apparently something is driving your CPU load, leading to the shutdown.

1 Like

i dont know how to find the usage.

i found this but dont know what it is or how its malfunctioning…
using th ps- aux command in putty

its using 35% of the cpu
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME
pi 343 35.3 6.6 282672 24888 ? Rsl 15:45 97:16

COMMAND
/home/pi/moonraker-env/bin/python /home/pi/moonraker/moonraker/moonr

This is moonraker, the interface process between Klipper and the web-interfaces like fluidd or mainsail.
No idea, why it is using 35% of your CPU.

  • Post your moonraker.log
  • What do you use a host computer? RPi 3?

i switched out components and sd card with a known working printer and the pi or the cables must be the problem.
currently setting up a wireless pi3a to replace the bad pi3b.
can a pi be diagnosed or repaired?