# Klipper: "MCU 'mcu' shutdown: Timer too close"

**URL:** <https://klipper.discourse.group/t/klipper-mcu-mcu-shutdown-timer-too-close/17332>\
**Category:** General Discussion\
**Created:** [June 28, 2024, 12:05pm UTC](https://klipper.discourse.group/t/klipper-mcu-mcu-shutdown-timer-too-close/17332 "2024-06-28T12:05:02Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Cyberwizzard](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/cyberwizzard/32/7627_2.png) [@Cyberwizzard](https://klipper.discourse.group/u/Cyberwizzard)\
**Post date:** [June 28, 2024, 12:05pm UTC](https://klipper.discourse.group/t/klipper-mcu-mcu-shutdown-timer-too-close/17332/1 "2024-06-28T12:05:02Z")

</div>

### Basic Information:

Printer Model: Voron 2.4  
 MCU / Printerboard: BTT Octopus v1.1  
 Host / SBC: RPi4  
 klippy.log

### Describe your issue:

I sporadically get a Timer too close error. I this time I was observing the error where the filament just changed, the Blobifier made its filament poop and the toolhead was moving from the corner of the machine to the printed object when this happened.

So when this triggered, there was no complex movement going on as far as I can determine.

I’ll attach the log and the plots, but it looks like there was a sudden lag spike on the host - although I am not sure why or how to debug that.

Any suggestions?  
[klippy.log](https://klipper.discourse.group/uploads/short-url/aQ7ZAlb7Q8VmW8rTXHynyG2yu53.log) (5.4 MB)

---

<div class="post-metadata">

**Author:** ![Cyberwizzard](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/cyberwizzard/32/7627_2.png) [@Cyberwizzard](https://klipper.discourse.group/u/Cyberwizzard)\
**Post date:** [June 28, 2024, 12:07pm UTC](https://klipper.discourse.group/t/klipper-mcu-mcu-shutdown-timer-too-close/17332/2 "2024-06-28T12:07:25Z")

</div>

System graph  
 ![timer_too_close_systemgraph](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/a/a7de0a2a8e2a1dcaa3364fa513a894312e016cc6.png)

---

<div class="post-metadata">

**Author:** ![Cyberwizzard](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/cyberwizzard/32/7627_2.png) [@Cyberwizzard](https://klipper.discourse.group/u/Cyberwizzard)\
**Post date:** [June 28, 2024, 12:07pm UTC](https://klipper.discourse.group/t/klipper-mcu-mcu-shutdown-timer-too-close/17332/3 "2024-06-28T12:07:57Z")

</div>

Load graph  
 ![timer_too_close_statsgraph](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/8/83ee33ce57200d80b3c6cca93e4fce4eac61eef7.png)

---

<div class="post-metadata">

**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\
**Post date:** [June 28, 2024, 1:19pm UTC](https://klipper.discourse.group/t/klipper-mcu-mcu-shutdown-timer-too-close/17332/4 "2024-06-28T13:19:40Z")

</div>

Generally, the reasons as listed in [Timer too close](https://klipper.discourse.group/t/timer-too-close/6634) do apply.  
For heavily modified Klipper versions no further guidance can be offered.

---

<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\
**Post date:** [August 27, 2024, 1:20pm UTC](https://klipper.discourse.group/t/klipper-mcu-mcu-shutdown-timer-too-close/17332/5 "2024-08-27T13:20:20Z")

</div>

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.