Planetary Bean Bouncer – DIY Flour Sifter Coffee Roaster

This is the Planetary Bean Bouncer, an open-source DIY coffee roaster based around a stainless-steel flour sifter drum, driven by a single motor using a wobble disc and planetary gear system.

The wobble disc converts motor rotation into a gentle orbital motion, helping tumble and mix beans evenly inside the drum for more consistent roasting.

This listing includes STL files only for the mechanical printed parts. Full documentation, electronics, firmware, BOM, and build notes are hosted externally.

What’s Included Here

• STL files for the current mechanical design

• Updated parts focused on cleaner wiring and enclosure routing

• Designed for hobbyist fabrication (3D printing + basic hardware)

• Optional fit and tolerance test prints to verify printer accuracy before printing the main parts.

What’s Not Included Here

• Electronics schematics or firmware

• Bill of Materials (BOM)

• Assembly instructions or calibration steps

For the full project (required to build):

• GitHub repository: https://github.com/geodave810/planetary-bean-bouncer

• Build log site: https://forum.v1e.com/t/diy-coffee-roaster/51195

• YouTube Playlist: https://www.youtube.com/watch?v=dA9DvBSW2dg&list=PLyy5iFdDEfauqgzqg_eptvup8FIkFzkNk&pp=gAQBsAgC

Project Overview

• Single-motor drive system

• Planetary agitator for even bean movement

• Flour sifter drum roasting chamber

• Modular, experimental design intended for iteration and customization

This project is actively developed and evolving. The STLs may change as the design is refined. Any changes will show up in the GitHub repository first.

Safety Note: This is an experimental DIY project involving heat, moving parts, and electrical components. It is intended for experienced makers. Please review the full build guide and documentation before attempting to build or operate this design.

Licensing

• Hardware (STLs): CC BY-NC 4.0

• Firmware & code (on GitHub): MIT License

Category: Kitchen & Dining