Lost connection to mcu ender 5

Basic Information:

Printer Model: Ender 5
MCU / Printerboard: Skr3 E3mini

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
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Describe your issue:

klippy (14).log (8.0 MB)
About a year ago i buyed a rasperry pi4 with 2 gb and installed klipper on my printer with skr mini e3 V3. Now i didn’t print for 2-3 weeks, and yesterday startet a print 190mm tall, my printer stopped at height 140 with the error lost connection to mcu. i restarted the print and the next one stopped at height 180. Today the same print stopped at height 40. I cannot understand why and where to find the problem, i also tried another usb cable today.

Refer to Timeout with MCU / Lost communication with MCU
In almost every case this is related to your hardware. Unfortunately, finding the culprit can be tricky.

Just my 2 ct. I studied your klippy.log for almost 1h.

I agree with

It also shows “b’Got EOF when reading from device’”

Before checking the hardware, I would start over with a new, fresh SD card and give it a try.

Oh, I forgot. If you try that, please create a fresh kippy.log.

Good luck, hcet14

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