Printer Model: Ender 3 Pro MCU / Printerboard: BTT EBB42 / Creality 4.2.2 Host / SBC: Raspberry Pi 4b klippy.log Describe your issue: I just finished installing a BTT EBB42 board with the USB to CANbus expansion board from BTT. Everything is wired up properly. Everything has been tuned using…

Found the source of the problem. I have a shop light that’s mounted above the printer and the AC power cord was too close to the CAN cable. I rerouted the power cable to keep it at least a foot away, and the firmware restarts stopped. Thanks for the help everyone!

[image] kausticklown: Thanks for any suggestions! Maybe uploading the klippy.log?

Sorry, thought I had it added. Thanks for any suggestions!

I removed the USB web camera I was using to stream my prints, along with the UPS apc server I was running. After a reboot I still am having an issue with the print failing due to a firmware restart. Could this be coming from the CANBus board? Thanks

[image] kausticklown: Could this be coming from the CANBus board? Thanks All shutdowns are related to the main MCU and not to the CAN board. This does not mean that the CAN board cannot be the root cause and make the main MCU fail. Unfortunately, only systematic analysis will reveal it, as th…

Can I ask how you’ve implemented your CAN cable as well as how you are doing your power wiring (ie is the light and AC on the same circuit as your printer)? I’m always interested in understanding EMI issues.

Random Firmware Restarts

General Discussion

Sineos July 21, 2025, 4:09pm 6

See Timeout with MCU / Lost communication with MCU

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Random Firmware Restarts

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