DIY conveyor belt keyboard from Google Japan

A step-by-step build guide explains how to construct a motorized "moving keys" conveyor-belt keyboard, providing 3D model files, a full bill of materials, firmware resources (including prebuilt binaries), and detailed assembly instructions. Two editions are noted - the motorized moving-keys edition (documented) and a Bluetooth connection edition (coming soon). The parts list includes 18 types of 3D-printed pieces (157 total prints), 116 conveyor-belt links and matching low-profile Kailh Choc V1 switches and keycaps, sprockets, shafts, bearings, fasteners, timing pulleys and belt, plus electronics such as a DC 6V N20 metal-gear motor (150 RPM), DRV8833 motor driver, and an ATOMS3 Lite controller. The guide also lists insert nut counts and common off-the-shelf alternatives (e.g., OD 21mm pipe for BottomTube).

Assembly is organized into six clear steps with practical specifics: press M4 (×14) and M2.5 (×8) heat-set insert nuts into designated 3D parts, mount the motor and driver to the MotorSupport, assemble two 3 mm shafts with an ordered sequence of SprocketA/B/C sprockets and 623ZZ/MR63ZZ bearings, secure shafts with collars and set screws, fit 2GT 20T timing pulleys and a 110 mm timing belt between motor and drive shaft, form four conveyor loops from the 29-link columns and install switches and keycaps, and wire the ATOMS3 Lite to the DRV8833 with 220 µF and 0.1 µF capacitors before fitting outer covers to complete the build.