Permission denied: '/tmp/printer''

[scarecrow2k6]

klippy.log

I read one or two posts on this issue and one of them did not list the serial correctly (which I did)- #1296

The second one was too technical for me to understand- #1902

UPDATE: I found a 3rd post, don't know if it is related but sounds similar to the second post (above). Again, too technical for me to understand :(

My issue resembles more with the first one. I should mention that I have been using a Rock64 with DietPi->Octoprint instead of a RPi. It worked perfectly well last year, haven't used the printer since March and I think some kind of update might have broken it but I might be wrong. I would really appreciate some feedback. Thanks!

[jakep82]

The log indicates that it's not seeing your MCU.

Unable to open port: [Errno 2] could not open port /dev/serial/by-id/usb-Klipper_lpc1768_1CB0FF14089DC5AEB375C656C62000F5-if00: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-Klipper_lpc1768_1CB0FF14089DC5AEB375C656C62000F5-if00'

What is the output of ls /dev/serial/by-id/*

[scarecrow2k6]

The log indicates that it's not seeing your MCU.

Unable to open port: [Errno 2] could not open port /dev/serial/by-id/usb-Klipper_lpc1768_1CB0FF14089DC5AEB375C656C62000F5-if00: [Errno 2] No such file or directory: '/dev/serial/by-id/usb-Klipper_lpc1768_1CB0FF14089DC5AEB375C656C62000F5-if00'

What is the output of ls /dev/serial/by-id/*

The output of ls /dev/serial/by-id/*

/dev/serial/by-id/usb-Klipper_lpc1768_1CB0FF14089DC5AEB375C656C62000F5-if00

[scarecrow2k6]

Anyone?

[Sineos]

I do not know DietPi, so just a wild stab:

• Is serial enabled? Check serial settings in dietpi-config command
• What are the permission of /dev/serial/by-id/usb-Klipper_lpc1768_1CB0FF14089DC5AEB375C656C62000F5-if00? Show the output of ls -al /dev/serial/by-id/*
• Just for testing: Do a sudo chmod 666 /dev/serial/by-id/usb-Klipper_lpc1768_1CB0FF14089DC5AEB375C656C62000F5-if00 (note down the original permissions to revert to, since this is not a long term solution)

[scarecrow2k6]

I do not know DietPi, so just a wild stab:

* Is serial enabled? Check serial settings in  `dietpi-config` command

* What are the permission of `/dev/serial/by-id/usb-Klipper_lpc1768_1CB0FF14089DC5AEB375C656C62000F5-if00`? Show the output of `ls -al /dev/serial/by-id/*`

* Just for testing: Do a `sudo chmod 666 /dev/serial/by-id/usb-Klipper_lpc1768_1CB0FF14089DC5AEB375C656C62000F5-if00` (note down the original permissions to revert to, since this is not a long term solution)

The output of ls -al /dev/serial/by-id/* is:
/dev/serial/by-id/usb-Klipper_lpc1768_1CB0FF14089DC5AEB375C656C62000F5-if00 -> ../../ttyACM0

I have no idea what that means :(

[Sineos]

Please post the entire output. Should look like

pi@octopi ~ $ ls -al /dev/serial/by-id/*
lrwxrwxrwx 1 root root 13 Oct 18 08:41 /dev/serial/by-id/usb-Klipper_lpc1769_0C70001625813AAF86E06B5CC32000F5-if00 -> ../../ttyACM0
pi@octopi ~ $

Under which user do you run klipper? If you do not know, then start klipper and issue the command ps axu |grep klipper. Should look like:

pi@octopi ~ $ ps axu |grep klipper
root      6906  0.0  0.1   2144  1308 ?        S    Oct06  17:40 /usr/local/bin/klipper_mcu -r
pi       12845  0.0  0.0   7348   484 pts/2    S+   19:46   0:00 grep --color=auto klipper
pi       32764  3.4  2.6  77020 23816 ?        Sl   Oct18 171:07 /home/pi/klippy-env/bin/python /home/pi/klipper/klippy/klippy.py /home/pi/printer.cfg -l /tmp/klippy.log
pi@octopi ~ $

The line
pi 32764 3.4 2.6 76504 23428 ? Sl Oct18 171:12 /home/pi/klippy-env/bin/python /home/pi/klipper/klippy/klippy.py /home/pi/printer.cfg -l /tmp/klippy.log
is klipper. The first entry (in my case pi) is the user.

When you have the user issue the command groups your_user_here. Looks like:

pi@octopi ~ $ groups pi
pi : pi adm tty dialout cdrom sudo audio video plugdev games users input netdev spi i2c gpio
pi@octopi ~ $

If you do not see dialout in this list, then issue the command sudo usermod -a -G dialout your_user_here

Finally log off the shell, log back in and restart klipper.

[jchidley]

This week I installed Octopi from scratch and ran a sudo apt update && sudo apt upgrade. I created a new user (jack), installed klipper and changed my group ownerships to the same as pi.

jack@octopi2:~/klipper $ groups jack
jack : jack adm tty dialout cdrom sudo audio video plugdev games users input netdev spi i2c gpio

jack@octopi2:~/klipper $ ls -l /tmp/printer
lrwxrwxrwx 1 jack jack 10 Oct 26 17:21 /tmp/printer -> /dev/pts/0
jack@octopi2:~/klipper $ ls -l /dev/pts/0
crw-rw---- 1 jack tty 136, 0 Oct 27 10:33 /dev/pts/0

I can only connect to /dev/pts/0 and not /tmp/printer (this gives a permissions error) from OctoPrint

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[mberlinger3]

Posted a solution in #1902 for changing octoprint.service