Random connection to mcu problems even if not in use

Basic Information:

Printer Model: Ender3 v3 Se
MCU / Printerboard: STM32 STANDARD mcu
Host / SBC rasp pi 3b 4gb fluidd with klipperscreen
klippy.log

moonraker.log (3).txt (19.8 KB)

klippy.log (4).txt (195.4 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

Getting some random klippy mcu disconnects for about a month now. Pre klipper screen it worked near flawless. Now it shuts down randomly.

Even if printer is in standby.

Somtimes 4times a day sometimes once every 2 days.

Replaced the mobo of the printer with a other standard replacement, tried about 6 usb cables , reflashed the printer , reeinstalled the raspberry software, set the system up without the klipperscreen.

Next step is to try a new sd (have a new endurace 32gb sb on hand now) for the raspberry but i’m not convinced it will help.

Cant figure is out, i’m fairy new to printer cfg files so i’m operating with a basic en research knowledge.

If the disconnects happens i need to power the printer off and on again,just a reset of the host is not enough.

totally spitballing here - power supply issue maybe?

Basic Information:

Printer Model: Ender3 v3 Se
MCU / Printerboard: STM32 STANDARD mcu
Host / SBC rasp pi 3b 4gb fluidd with klipperscreen
klippy.log

moonraker.log (3).txt (19.8 KB)

klippy.log (4).txt (195.4 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

Getting some random klippy mcu disconnects for about a month now. Pre klipper screen it worked near flawless. Now it shuts down randomly.

Even if printer is in standby.

Somtimes 4times a day sometimes once every 2 days.

Replaced the mobo of the printer with a other standard replacement, tried about 6 usb cables , reflashed the printer , reeinstalled the raspberry software, set the system up without the klipperscreen.

Next step is to try a new sd (have a new endurace 32gb sb on hand now) for the raspberry but i’m not convinced it will help.

Cant figure is out, i’m fairy new to printer cfg files so i’m operating with a basic en research knowledge.

If the disconnects happens i need to power the printer off and on again,just a reset of the host is not enough.

Powersupply of the printer?

Changed the powercable of the printer and the powerblok ,maybe to much wiggle in the blok noticed i a little wiggle on the contacts of the pi powersupply and the blok is also under the table of the printer (resonance?) changed the powersupply of the pi some time ago had some low voltage problems in beginning of the build.

Not yet set up the new sd card but the problem isn’t showing up in the past 2 days , its a head scratcher.

As an annoying Monday morning Quarterback I would say one of the first rules of troubleshooting is to ask yourself “What’s changed?”

In your case, the ‘klipper screen’ was added. Probably one of the very first things you should have done was to examine it’s connections, and if they seemed fine, and it did not appear to be a visible physical thing, you should have undone what you did to add it, and put the system back into the state it was in when it worked fine. If it worked fine again, then you’ve isolated the issue. Now you can decide why. Was the klipper screen semi-horked? Was the system now sucking more power than the supply could reliably provide? Whatever. You’d have isolated the issue to a known set of hardware components, so then you could focus on the narrow issue.

Randomly changing a bunch of stuff that were previously not an issue only invites confusion and pain. Everyone does this at times. I have to make myself not do this, and fail still at it sometimes. My Grampa used to say “no matter how far you’ve gone done the wrong trail, it’s still faster to go back and take the right trail.”

Maybe put it back into the known good state, and start over so you actually KNOW why it was resetting. Better now than 90% into a 30 hour print…

/end_boomer_advice :wink:

1 Like

Well i know i didnt list it chronilogically but i did that.

First removed klipper screen software after checking the connections nok

Removed the physical screen nok

Then remembered it had a groundfault when it was a standard printer → new stm32 mobo

New usb cables nok

New power cord printer and blok nok

Now i’m here .

Well for the moment the shutdown is not there anymore , the printer is now longer online than it had been sinds past months , possible for a bad computer powersuply cord to do this? Or a connection in a powerblok ? I don’t know

The powersupply for the pi was previous this, was running octoprint back then.

Thanks for the advice btw

The powersuply of the printer is more than double it needs no big changes in the printersetup

The pi has a the better official power supply

Well still no shutdown after 4 days of printing.

I’m going to write it up as a extention block or printercable powersupply connection problem.

Just had a other mcu shutdown

So not yet resolved

Please post that klippy.log.

1 Like

klippylog_(5)txt_1211_200625.zip (4.0 MB)

Restarted from 0, new sd new install new flash

Problem not returning.

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