One printer unreachable when other printer is turned on

General Discussion
1

Basic Information:

Printer Model: Ender 3 V1 & Ender 3 V2
MCU / Printerboard: BTT SKR Mini E3 V2 & Stock Creality 4.2.2 respectively
Host / SBC: Raspberry Pi 4B
klippy.log

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:

Good evening,
I have two printers connected to a Pi 4B as a host. I have installed everything using KIAUH and done a fresh install twice. Oddly, each printer will work perfectly on their own, but when I connect the other printer, the Ender 3 V2 always goes offline, with the logs indicating an input/output error. I tried everything I could think of, changing the serial address to a path instead of ID, reflashing the firmware, blocking the 5V USB pins with tape to reduce load on the Pi/interference. Any ideas what could be wrong with my setup?
klippye3v1.log (17.0 KB)
klippye3v2.log (53.0 KB)

2

A number of printer control boards, including the Ender 3 stick boards, will try to back-power the USB host that they are connected to, and if there is a slight difference in the 5v of the host strange things can happen.

However, since you’ve already tried the typical solution for this:

take a look at the last few lines of the output of dmesg -H when this happens, this may give us additional insight into what exactly is going on here.

I’d expect we may see the V2 going offline for one reason or another.

3

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