Unable to save printer.cfg, log shows old config after "save and restart"

General Discussion
1

Basic Information:

Printer Model: DIY Laser Cutter
MCU / Printerboard: MKS Monster8 V2
Host / SBC: Pi 3B+
klippy.log

I am not sure what I am missing but I have been banging my head against the wall for some time over what seems to be a really simple problem:

I changed my Serial Port of my MKS Monster8 on my Pi and got the new serial port via ls /dev/serial/* on my pi via PuTTY and got the serial port to be usb-Klipper_stm32f407xx_3B004F000551333131333837-if00.

However when I change that in printer.cfg and click “save and restart”, somehow Klipper does not “accept” that line as my klippy.log still shows the old serial port. Unsurprisingly, I get an error that my MCU cannot connect as the port is not found.

I’ve tried manually restarting klipper via Mainsail, rebooting my pi (a couple of times) and even deleting the entire printer.cfg file and adding it back again but somehow klipper has just decided that this one line of config will not be changed.

I suspect that there is something sinister going on behind the scenes. Is there a way I can force a total rebuild of the printer.cfg and purge all cache?

Thanks in advance for any help!

klippy.log (12.4 KB)

2

Make sure to edit the correct file. According to the provided log, Klipper is expecting his cfg to be

/home/pi/printer_data/config/printer.cfg

In doubt, try modifying the file from the shell, e.g. via

nano /home/pi/printer_data/config/printer.cfg
3

I just checked via nano /home/pi/printer_data/config/printer.cfg and the config reflects my change…

Also I re-imaged MainsailOS on my SSD but somehow it still manages to retrieve the old serial port :exploding_head:

4

Came across this and just to be sure I checked to make sure I didn’t get confused by the Klippy logs:

what is this
what is this1913×996 125 KB

5

Please attach your entire printer.cfg file.