# Lost communication with MCU 'EBBCan' **URL:** \ **Category:** General Discussion\ **Created:** [October 10, 2025, 8:30pm UTC](https://klipper.discourse.group/t/lost-communication-with-mcu-ebbcan/24993 "2025-10-10T20:30:58Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Guaposo](https://avatars.discourse-cdn.com/v4/letter/g/90db22/32.png) [@Guaposo](https://klipper.discourse.group/u/Guaposo)\ **Post date:** [October 10, 2025, 8:30pm UTC](https://klipper.discourse.group/t/lost-communication-with-mcu-ebbcan/24993/1 "2025-10-10T20:30:58Z")
### Basic Information: Printer Model: Custom Build MCU / Printerboard: BTT Octopus Host / SBC: BTT Pi V1 klippy.log ### Describe your issue: Hello! My printer was working fine for about 600+ hours, but now it is shutting down klipper after some hours printing. It uses CAN Bus Bridge from the octopus board to the EBB42, and it error says that Lost communication with MCU ‘EBBCan’. I have no idea how to approach this, only that the cables are tight fit and not moving, i don’t know if this is caused by overheating, i print mainly with PLA, sometimes with ABS or PETG, that it might heat things up a bit but never above 70ºc as it shows on the graphs. To the CAN cable, i used an shielded one, that would in theory prevent some miscommunication between the ebb42 and the mainboard. Can someone help me diagnose this? ![image](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/a/a/aaf25a4d77100da75cb2c7f4577da7614f801400.jpeg) [klippy(4).zip](https://klipper.discourse.group/uploads/short-url/arBNat3qWDed513bc7o9ie9eTbx.zip) (4.7 MB) ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [December 9, 2025, 8:31pm UTC](https://klipper.discourse.group/t/lost-communication-with-mcu-ebbcan/24993/2 "2025-12-09T20:31:56Z")
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