This is a Custom Ortho 40% Mechanical Keyboard designed from the ground up to be compact, practical, and DIY-friendly. Built around a hand-soldered Arduino Pro Micro, it’s a minimalist yet powerful little board that fits perfectly into my workflow while showcasing a unique split spacebar layout.

With just 46 keys, it strikes a balance between portability and functionality—ideal for enthusiasts who enjoy the challenge (and satisfaction) of smaller form-factor boards. Whether you’re a seasoned builder or tackling your first custom keyboard, this project keeps things straightforward while still feeling truly custom.

Parts & Components

• 46 keycaps
• 46 switches (3- or 5-pin compatible)
• 46 diodes (1N4148 recommended)
• 2× 2u plate-mount stabilizers
• 6× M2 screws
• Arduino Pro Micro (or compatible)

Printing & Assembly

Inspiration & Resources
This design was shaped by some amazing community resources:

Hackaday: Using a Pro Micro in a Keyboard

Keyboard Layout Editor

KB Firmware Generator

Originally dreamed up back in Grade 11, this project represents the kind of tinkering that pulled me deeper into hardware design, 3D printing, and the endless rabbit hole of mechanical keyboards.