Assembly Overview

Both PolyKybd Split72 halves with lit keycap legends, rendered from the KiCad models

The PolyKybd Split72 can be assembled in a few different ways depending on how much of the build you want to do yourself.

A finished pair — both halves joined by the link cable, the right one fitted with a trackball in its expansion slot:

Both Split72 halves on a desk, connected by the link cable, keycap OLEDs showing their legends

In profile, so you can judge the height the case and keycaps add:

Your options

Kit (recommended for most people)

A kit containing all parts and pre-assembled PCBs is planned via CrowdSupply. Sign up to be notified when it becomes available:

crowdsupply.com/polykybd/polykybd

The kit includes the PCBs with all SMD components already soldered, so you only need to assemble the mechanical parts.

Partial DIY

Order PCBs assembled from a PCB manufacturer (JLCPCB, PCBWay, etc.) using the gerber files and BOM in the repo, then 3D print the case and stems yourself.

Full scratch build

Build absolutely everything from source — order bare PCBs, source all components individually, print all parts. This is for experienced builders who want full control.

Build video

A full build video is available on YouTube:

Watch the build video →

What you will need

Before starting, gather all required parts. See the full Parts List for details.

At a high level you need:

Left and right PCBs (assembled)
Left and right aluminum plates (1.2mm)
Left and right 3D-printed cases
72× key switches (MX-compatible)
72× custom 3D-printed key stems (three profiles to choose from)
72× 0.42” OLED displays with FPC cables
72× transparent relegendable keycap covers
2× (optional) 0.96” status displays
USB-C cables (one short for between halves, one for the computer)
8× M3×10 hex screws and M3 hex nuts

Next steps

Read the full Parts List
Order your PCBs or wait for the kit
Print or order your Case & Spacer
Prepare your Displays
Choose Compatible Switches
Follow the Step-by-Step Build Guide