This is a physical volume mixer based on a github project: https://github.com/omriharel/deej.

I used these potentiometers and an arduino nano. To keep the Arduino Nano in place I used some steel wire push rods. If anyone needs it I could make a model where the nano is held in place with screws.

My print settings:
* 0.4mm nozzle
* 0.2mm layer height
* 15% infill
* 3 walls
* supports just for the usb opening

For the DeejTopPart.stl i added a color change (M600) before layer 16.

This is my config.yaml:

# process names are case-insensitive
# you can use 'master' to indicate the master channel, or a list of process names to create a group
# you can use 'mic' to control your mic input level (uses the default recording device)
# you can use 'deej.unmapped' to control all apps that aren't bound to any slider (this ignores master, system, mic and device-targeting sessions) (experimental)
# windows only - you can use 'deej.current' to control the currently active app (whether full-screen or not) (experimental)
# windows only - you can use a device's full name, i.e. "Speakers (Realtek High Definition Audio)", to bind it. this works for both output and input devices
# windows only - you can use 'system' to control the "system sounds" volume
# important: slider indexes start at 0, regardless of which analog pins you're using!
slider_mapping:
  0: master
  1: 
    - xdefiant.exe
    - BlackOpsColdWar.exe
  2: discord.exe
  3: deej.unmapped
set this to true if you want the controls inverted (i.e. top is 0%, bottom is 100%)
invert_sliders: true
settings for connecting to the arduino board
com_port: COM3
baud_rate: 9600
adjust the amount of signal noise reduction depending on your hardware quality
supported values are "low" (excellent hardware), "default" (regular hardware) or "high" (bad, noisy hardware)
noise_reduction: default

You can get the Arduino file from the github.

Happy printing!