Or do you use a board at all? Let’s explore some options ... The only other example our searches turned up of circuits involving mostly basic components being applied to 3D printed objects ...

On a circuit board, discrete components are intermingled with the ... THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

No user-serviceable parts inside? Give me a break! The head unit is tough to get to, but the PCBs within the chassis use ...