Printer Model: LDO Voron 0.2-S1
MCU / Printerboard: SKR Pico
Host / SBC: RPi 4
klippy.zip (1.3 MB)
Can’t find the reason for seemingly random “Lost communication with MCU” errors causing print failures at different layers.
I re-checked all the cables and disconnected RPi Camera Module 3 Wide and both Vector3D Daybreak Neo Minis with no changes.
Unfortunately, there is not much we can contribute apart from the items already listed here: Timeout with MCU / Lost communication with MCU
For whatever reason, the respective MCU has suddenly stopped responding. Klipper realizes this, but has no way of knowing why it did this. Like you cannot ask someone why he is not answering when the phone line has been cut.
Are there any logs on the RPi (MainsailOS) side I could look into?
In the syslog or via the dmesg command you might see some USB messages, indicating that the device fell off the bus. But they are usually as helpful as Klipper’s error message. Your OS equally just realizes “Oops, its gone”
Around this time the print stopped:
Jun 16 02:31:04 z2cam python[571]: [update_manager.py:_handle_auto_refresh()] - Klippy is printing, auto refresh aborted
Jun 16 02:43:57 z2cam python[571]: [klippy_connection.py:_process_status_update()] - Klippy has shutdown
Jun 16 02:43:57 z2cam python[571]: [proc_stats.py:_handle_shutdown()] -
Jun 16 02:43:57 z2cam python[571]: Moonraker System Usage Statistics:
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498608.088132, Usage: 1.28%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498609.088179, Usage: 1.39%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498610.088955, Usage: 1.31%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498611.090827, Usage: 1.33%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498612.093212, Usage: 1.43%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498613.096457, Usage: 3.77%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498614.095549, Usage: 1.54%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498615.097226, Usage: 1.35%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498616.098481, Usage: 1.4%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498617.099949, Usage: 1.41%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498618.101275, Usage: 1.36%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498619.102140, Usage: 1.41%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498620.102482, Usage: 1.3%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498621.103282, Usage: 1.31%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498622.104716, Usage: 1.28%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498623.106939, Usage: 3.8%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498624.104813, Usage: 1.48%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498625.107342, Usage: 1.33%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498626.107101, Usage: 1.37%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498627.107647, Usage: 1.33%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498628.109926, Usage: 1.3%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498629.109573, Usage: 1.37%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498630.111577, Usage: 1.24%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498631.113210, Usage: 1.34%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498632.117032, Usage: 1.23%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498633.120685, Usage: 3.74%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498634.119578, Usage: 1.39%, Memory: 53352 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498635.120237, Usage: 1.07%, Memory: 53356 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498636.121331, Usage: 1.03%, Memory: 53356 kB
Jun 16 02:43:57 z2cam python[571]: System Time: 1718498637.121808, Usage: 1.04%, Memory: 53356 kB
Jun 16 02:43:57 z2cam python[571]: CPU Temperature: 48.686
Jun 16 02:43:57 z2cam python[571]: [proc_stats.py:_handle_shutdown()] - Throttled Flags:
Jun 16 03:10:01 z2cam CRON[7238]: (root) CMD (test -e /run/systemd/system || SERVICE_MODE=1 /sbin/e2scrub_all -A -r)
Jun 16 03:11:02 z2cam systemd[1]: Starting Online ext4 Metadata Check for All Filesystems...
Jun 16 03:11:02 z2cam systemd[1]: e2scrub_all.service: Succeeded.
So re-checking the cables again it is, I suppose.
Well, looks like checking your cables for the second or third time might be worth it: finally a completed print!
Did you find any actual defect?
No, but I’m printing without any stops for the 9th hour in a row after I replaced the USB cable connecting Pi to Pico for the second time.
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