An Incredible Working Ball Machine Made Completely Out of K'Nex Building Pieces
Citadel Knex Ball Machine - Over 45 New Elements! on Make a GIF
34 New Knex Elements - YouTube
The Official Guide to K'NEX Ball Machine Elements : 79 Steps (with Pictures) - Instructables
This is probably the first time posting anything about my ball machine here. I'm making decent progress and only have to attach the elements now, but I will still need to clean
K'nex Ball Machine Element: Tire Stairs - YouTube
Knex Ball Machine Element - Domino Stairs - YouTube
The Citadel Is The King Of K'nex Builds. | Hackaday
Insane ball machine built entirely out of K'Nex - CNET