2 layers26 × 18.1 mm

PeakDetector Breakout
S4-Lab/OpenPCB
Open source method of manufacturing 2-layer printed circuit boards with a low-cost commodity fiber laser engraver
10 parts3MIT
Open-source boards designed in KiCad by S4-Lab on GitHub, from 1 repository. A board’s address here is its repository’s there.

S4-Lab/OpenPCB
Open source method of manufacturing 2-layer printed circuit boards with a low-cost commodity fiber laser engraver