# MCU Disconnect after first/second layer **URL:** \ **Category:** General Discussion\ **Created:** [February 11, 2024, 3:29pm UTC](https://klipper.discourse.group/t/mcu-disconnect-after-first-second-layer/14037 "2024-02-11T15:29:44Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Brian](https://avatars.discourse-cdn.com/v4/letter/b/97f17d/32.png) [@Brian](https://klipper.discourse.group/u/Brian)\ **Post date:** [February 11, 2024, 3:29pm UTC](https://klipper.discourse.group/t/mcu-disconnect-after-first-second-layer/14037/1 "2024-02-11T15:29:44Z")
### Basic Information: Printer Model: Axion Airwolf MCU / Printerboard: SKR Mini V3 `klippy.log` [klippy (8).log](https://klipper.discourse.group/uploads/short-url/lCnVxaQwdkssUSFLadbLrlyqBMG.log) (482.8 KB) _Fill out above information and_ **_in all cases attach your_ `klippy.log` _file_** (use zip to compress it, if too big). _Pasting your_ `printer.cfg` _is **not** needed_ _ **Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there** _ ### Describe your issue: …Ok Here is my issue and what i have done: MCU disconnects after first layer on test prints for calibration. I am currently taking my sons school Axiom Airwolf3d and making it a klipper machine. I have taken out the old board and put in a SKR mini v3, completely designed and printed a new direct drive unit using a e3d V6 clone and extruder with a bl touch. I have been able to get everything running and have done all the basic calibrations IE PID tune, Acceleration tuning, E-steps/ rotation, and bed mesh. I have no issue running all the basic step and can also pre-heat nozzle and bed and it will run for like 15 minutes no problem. I then start a print and first layer and skirt come put fine but goes to second layer and get disconnect. I am using the USB cord that came with the SKR mini and have the connection to the MCU by-path. serial: /dev/serial/by-path/platform-3f980000.usb-usb-0:1.5:1.0 I tried by id but was having issues with it. I have looked at all the different form post and have not found an answer and don’t know where to look in the klippy log to find answer. i have seen alot of bad usb cables but i have good connection until the printing works. Looking for any help to have this working for school as it is a $3k machine that does not work. ---
**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:** [February 11, 2024, 5:09pm UTC](https://klipper.discourse.group/t/mcu-disconnect-after-first-second-layer/14037/2 "2024-02-11T17:09:29Z")
See [Timeout with MCU / Lost communication with MCU](https://klipper.discourse.group/t/timeout-with-mcu-lost-communication-with-mcu/6639) ---
**Author:** ![Brian](https://avatars.discourse-cdn.com/v4/letter/b/97f17d/32.png) [@Brian](https://klipper.discourse.group/u/Brian)\ **Post date:** [February 20, 2024, 12:29pm UTC](https://klipper.discourse.group/t/mcu-disconnect-after-first-second-layer/14037/3 "2024-02-20T12:29:12Z")
So I got it to work by manually taking out every connection and putting them back into place, Must have been a bad connection somewhere. Thanks ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [March 21, 2024, 10:29pm UTC](https://klipper.discourse.group/t/mcu-disconnect-after-first-second-layer/14037/4 "2024-03-21T22:29:20Z")
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