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this post was submitted on 20 Dec 2023
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I had a similar issue when I initially installed Klipper on my Ender 3 S1 (not the plus). It would not connect unless I fully restarted Octoprint whenever I turned on the printer. The change I needed to make was go into settings in Octoprint (though I assume its similar on other front ends), and add the following settings:
Serial Port: /tmp/printer
Baud Rate: 11520
If that is not the case for you, try to add some more details. Do you have the config file correct?
I'll look for baudrate, but doesn't explain why it's work when I flash the firmware again...