The LEGO GBC "Pneumatic Ball Factory V3.0" MOC by Quanix 2019 - YouTube
GBC Ball Factory Complete Build! | Great Ball Contraption complete build in "circuit" mode is here...finally. After much frustrating tuning, the Ball Factory now works...more or less. It... | By Whiplash LegoFacebook
41pc Lot Black Lego Bionicle Technic Hero Factory Body Ball Joints Socket | eBay
MOC REVIEW] Akiyuki's Ball Factory - Page 8 - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
Ball Factory V2 | Planet GBC
LEGO MOC Ball Factory by TheRebricker | Rebrickable - Build with LEGO