# Unable to connect to MCU Octoprint

**URL:** <https://klipper.discourse.group/t/unable-to-connect-to-mcu-octoprint/15960>\
**Category:** General Discussion\
**Created:** [April 22, 2024, 8:19pm UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-octoprint/15960 "2024-04-22T20:19:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Starfish](https://avatars.discourse-cdn.com/v4/letter/s/87869e/32.png) [@Starfish](https://klipper.discourse.group/u/Starfish)\
**Post date:** [April 22, 2024, 8:19pm UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-octoprint/15960/1 "2024-04-22T20:19:50Z")

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### Basic Information:

Printer Model: Version 1.9.3, Voron 1, Chrome, MacOs  
Build 2023.10.09.151442 with “webcamd”, based on OctoPi 1.0.0, running on Raspberry Pi 4 Model B Rev 1.5  
 MCU / Printerboard: BIGTREETECH SKR Pico V1.0 Controller  
 Host / SBC: rpi 4 model b  
 klippy.log:  
[octoprint-systeminfo-20240422160124.zip](https://klipper.discourse.group/uploads/short-url/bHK8dDbJ1f5MODfbvX2MbM5ktCW.zip) (12.5 KB)

### Describe your issue:

mcu ‘mcu’: Unable to connect  
Klipper state: Not ready

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**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\
**Post date:** [April 23, 2024, 5:55am UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-octoprint/15960/2 "2024-04-23T05:55:30Z")

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Hello @Starfish !

Please attach the klippy.log to your **next post**.

Also read this:

> [@Klipper Architecture / Ecosystem](https://klipper.discourse.group/t/klipper-architecture-ecosystem/6313/1):
>
> Klipper Architecture / Ecosystem Calling Klipper a 3D printer firmware is not complete to its full extent. In fact it is a 3D printing application with an associated ecosystem. The following overview shows how the different aspects interact. Only the red boxes is Klipper in its original sense, the other boxes are independent products forming the entire ecosystem. Klipper Host The core of the Klipper environment Typically running on a Single Board Computer (SBC), …

You connect OctoPrint to Klipper by using `/temp/printer`  
Klipper connects to the printer with with a certain USB serial that has to be found.

> **[Installation - Klipper documentation](https://www.klipper3d.org/Installation.html#building-and-flashing-the-micro-controller)**

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\
**Post date:** [June 22, 2024, 5:56am UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-octoprint/15960/3 "2024-06-22T05:56:15Z")

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