MCU Problem | VORONDesign | Page 1

ashen seal Dec 23, 2025, 4:11 PM

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I just bootet my Voron 2.4R2 Pro. Now i got a problem with the serial number butg i couldnt find any solution. Could sb help me pleas?

pale oar Dec 23, 2025, 4:16 PM

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can you please upload a klippy.log file (there is a link on the red error message to get it)

ashen seal Dec 23, 2025, 4:22 PM

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📎 klippy.log

pale oar Dec 23, 2025, 4:23 PM

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ok. your klippy log reveals that your actual [mcu] section is a bit of a mess

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worthy oasis Dec 23, 2025, 4:24 PM

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you've specified both serial and canbus_uuid?

[mcu]
serial: /dev/serial/by-id/usb-Klipper_stm32f446xx_040021001750344139363220-if00
canbus_uuid: 7f8f8e48ad0a```

pale oar Dec 23, 2025, 4:24 PM

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i wondered if this might be the case from the canbus uuid's at the top of your second screenshot

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if you are using canbus, you do not need a serial: ... section, just a canbus_uuid: ... section

ashen seal Dec 23, 2025, 4:27 PM

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after using # the problem is gone. Thank you. why does my printer dont need an Serial? every Video i wathcen i mfound everyone is using serial

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Watched i found out*

pale oar Dec 23, 2025, 4:27 PM

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serial is only used when you are using plain usb to talk to your mainboard

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if you are using canbus, you need canbus UUIDs

ashen seal Dec 23, 2025, 4:29 PM

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ok thank you

#MCU Problem