3D-printing-info

Custom sounds in Klipper

Play WAV samples at startup, print start and print end through gcode_shell_command and USB speakers on a Raspberry Pi.

Hardware and referenceSource on GitHub

Playing custom WAV sounds on your raspberry pi in klipper HOWTO (I use 2001 Space Odyssey samples but knock yourself out with whatever you want for YOUR printer).

You will need

  1. A klipper printer

  2. A set of speakers ( I use these: https://thepihut.com/products/usb-powered-speakers ); these are USB/audio jack speakers. I have not experimented with a bluetooth speaker setup.

  3. A raspberry pi (I use a 4b 8GB)

  4. Optionally putty for windows

  5. Optionally WinSCP for transferring files from windows to your pi.

1 Install via kiauh, which you can find here:

...the advanced option: gcode shell command.

2 Enable audio in case you have not done so already: sudo raspi-config for that after ssh-ing into your pi or using putty if that's your preferred method to access the command line on your pi.

3 Create a shell command similar to my shell command here: https://github.com/oernster/VT350/blob/main/print_start.sh

NOTE: aplay and alsamixer are not required for bookworm distros of raspbian. HOWEVER, you need to add the following lines to /etc/asounds.conf, e.g. by sending the command sudo nano /etc/asounds.conf, then paste in and Ctrl X and y to exit.

defaults.ctl.card 0
defaults.pcm.card 0
defaults.pcm.device 0

This pre-supposes that you have a print_start.wav file. It also assumes you have aplay installed which if not on your variant of raspbian you can install with: sudo apt install aplay

You can customise the print_start.wav filename and shell script name as per your needs.

You may need to install this: sudo apt install alsamixer

This allows you to increase/set the volume of your speakers so you can actually hear something from your setup. You can run it as alsamixer from the command line.

Note that once you've adjusted any alsamixer settings, you can escape from the tool and then to ssave your changes run this command: sudo alsactl store

4 Create a config file such as shell_command.cfg here: https://github.com/oernster/VT350/blob/main/shell_command.cfg

This can be customised to your specific needs and wav files.

Include shell_command.cfg in your printer.cfg header files. You must have all the wavs and shell scripts in the same directory as your printer.cfg file.

What if I want a wav file to be played on printer startup?

To do that you need to add this to your printer.cfg:

[delayed_gcode startup]
initial_duration: 2
gcode:
    PRINTER_STARTUP_SOUND

Now, if you want to customise your macros to play specific sounds due to an event then simply make a call to the relevant gcode customised sound from the shell_command.cfg file we discussed earlier.

Examples can be found in my PRINT_START macro here: https://github.com/oernster/VT350/blob/main/configs/macros.cfg

ENJOY!!!

If you struggle to get it working, then debug with details from here: https://raspberrypi.stackexchange.com/questions/22708/is-there-some-trick-to-getting-aplay-audio-output-working