Knex Knife By Annix15 in LivingLEGO & K'NEX7862Save PDFFavoriteIntroduction: Knex KnifeBy Annix15Follow More by the author: About: I like to build all kinds of things, especially weapons! More About Annix15 » Hey guys, this time, I've made a knex Knife. It's not my best and was built in about 1 hour.