4 layers60 × 40 mm

Demo
shibukawa/bdf
BDF is a browser document-preview suite: it combines converters for many formats (Go/WASM), a browser renderer of about 23 KB gzipped, and a compact intermediate format.
7 parts51MIT
KiCad boards from 2 GitHub repositories tagged “csv”, the most starred first; open any of them in PCBKit.

shibukawa/bdf
BDF is a browser document-preview suite: it combines converters for many formats (Go/WASM), a browser renderer of about 23 KB gzipped, and a compact intermediate format.

Fescron/diy-logging-volt-ampmeter
DIY logging voltage/current meter