Raspberry Pi GPIO Overlay – Pinout Cheat Sheet

A clean, no-nonsense GPIO reference plate for Raspberry Pi users. This is a desk-friendly cheat sheet for the full 40-pin header — designed to be readable at a glance without opening yet another browser tab. The layout uses 3 mm pin holes instead of true-to-scale 1 mm, giving enough space to properly label each pin and keep everything clear in real-world use. For best results, I’d recommend scaling it up slightly — small text is still a bit of a nightmare to print cleanly. A 120% version is included in the 3MF if you want something that just works.