KiCAD Projects: Femto - RP2040 12x12mm PCB module
Femto is smallest RP2040 PCB module (12 x 12 mm). In comparison, closer competitors, such as Raspberry Pi Pico or RP2040 Stamp (Solder Party) have appropriately 51x21mm and 25x25mm.
This KiCAD project published as Open Source Hardware (OSHW) where you can download below:
Femto - RP2040 12x12mm PCB module