This is a complete copy of this:
https://www.thingiverse.com/thing:5269219

Just reworked/resized to fit on an Ender 3 v2 (220x220)
Also, I have made the fader slots deeper, the shafts of my linear pots didn't stick out of the front plate on the original design.
This will only just fit on the print bed without any skirts, rafts or brims.

I have test printed the Control Plate, Top and Bottom.
My printer started playing up whilst printing the body but it should fit just fine.

On the second PCF8574T, the one connected to the 8x buttons.
Move the jumper for A0 to the other pin, check the picture attached.

v2 files:

Reworked Switch plate as v1 didn't have any support for the bottom middle.
Moved screw holes on Bottom plate.
I have also included an extended button for those who want it.

Text below copied from original thing:

This is a MIDI control panel designed to work with MIDI-Mixer(https://www.midi-mixer.com/),
some software that is used to control application volume in windows.
Using plugins, it can also be used to control live streams or home assistants.

Everything was designed in Fusion 360 and I have provided the files for anyone who wants to make changes.

Parts List

13x OUTEMU Blue or another cherry compatible key switches5x 60mm linear potentiometer (45mm movement)13x ws2812b strip LEDs 100 leds/m is recommended 144 leds/m will probably also work2x PCF8574T Digital IO expansion1x Arduino Leonardo1x micro usb breakout14x m3x8mm button head screws22AWG stranded wire I bought this kit

Programming

The code for the control panel and assembly instructions can be found at
https://github.com/Theo428/Arduino-Midi-Control-Panel/tree/dev