K'nex Ball Machine Element Stairs By knex crazy in LivingLEGO & K'NEX78123Save PDFFavoriteIntroduction: K'nex Ball Machine Element StairsBy knex crazyFollow More by the author: About: I have always loved k'nex and legos but lately I have trend toward k'nex. My first ball machine really got me goin with k'nex and then I really saw their potential. I also love extreme sports like BMX, Snowboa… More About knex crazy »simple stairs that can join to blue yellow track