Instead of a PCB, with its layers of copper, substrate (usually fibreglass), solder mask, and silkscreen, Reddit user duzitbetter 3D-printed a thin layer that holds the Pico in place, as well as the wires that connect to the keys. With just nine keys to wire up, this method makes sense – it’s actually a throwback to point-to-point wiring, as seen in high-end audio appliances (if you have an especially high-end guitar amp or an old radio, you most likely own an example of point-to-point wiring).
The keycaps and the enclosure for the device are all 3D-printed, giving this object a lovely lo-fi feel, despite the high-tech nature of what it does.
![Controlled by Raspberry Pi Pico](http://images.ctfassets.net/2lpsze4g694w/2gMy7psdDqVGMed4faRycn/a042e259567f2ac4894ae0bcd780b1cc/Screenshot_2021-03-23_at_14.55.57.png?w=800)