Since I wasn't satisfied with the options that are currently available for 3D printing a Clone Hero guitar, I made my own!
I consider it slightly unfinished, because it doesn't have start/stop buttons (because I was too lazy to add them) and it doesn't have spots to put LED's. However, if I ever have the motivation to work on this model again I might add these features.

This model is made for the Raspberry Pi Pico 2, it supports MX type switches in the neck and in the body for the strum bar.
To build this guitar, you will need:
 - 1 Raspberry Pi Pico 2 (Wireless or not wireless, it doesn't matter)
 - 4 M2x10 screws
 - ~30 M3x10 screws
 - 7 MX style mechanical switches
 - (Optionally) 6 modular connectors, like some straight WAGO connectors to make the neck removable
 - some solid-core that's around 24awg

I uploaded a wiring diagram in the documentation section, if you're confused about how you are supposed to wire up the switches to the microcontroller, you should take a look at it.
I programmed the guitar with santroller, with the keyboard binds for clone hero. With santroller, you can program the guitar in such a way where it also works on consoles. For that, you should take a look at the santroller documentation. They also have a discord server where you can ask for help.