4 layers75 × 49 mm

Kamikazii
choicebuilds/SumoBot-v2
A Robojackets robot (v2) built from scratch, featuring a custom 4-layer PCB, STM32-based (ARM Cortex-M3) firmware written in C (STM32CubeMX + CMake), and a 3D-printed chassis.
59 parts
KiCad boards from 1 GitHub repository tagged “robo-sumo”, the most starred first; open any of them in PCBKit.

choicebuilds/SumoBot-v2
A Robojackets robot (v2) built from scratch, featuring a custom 4-layer PCB, STM32-based (ARM Cortex-M3) firmware written in C (STM32CubeMX + CMake), and a 3D-printed chassis.