Citadel Knex Ball Machine





Introduction: Citadel Knex Ball Machine

About: On my page you'll find lots of different Knex projects, from ball machine lifts to useful items. I hope you enjoy!  _______________________ Current avatar: Target of my skeeball machine Past avatars...

Hello everyone! After 3 years, my ball machine Citadel is finally finished! This machine features around 50 new elements, 5 different lifts, and 2 new path separators that separate into 17 paths. It's also themed, with Knex men all over the place working on it, giving it a factory-type feel with catwalks and stairs. There are 3 total motors, one of which powers all 3 floor lifts. The actual time it took to build is one year, there was just a long break in between. All of the paths (except one) were built in 6 months, starting in December 2015. I hope you enjoy!

Here are the element instructions!

Click here for more pictures!

Here's the video:

Here's the construction album.


Started building: Jan. 21, 2013

Finished building: June 20, 2016

Height: 8 feet

Width: 5 feet 3 inches

Depth: 4 feet 2 inches

Pieces: 50,000 - 60,000

Thanks for viewing!



    • Oil Contest

      Oil Contest
    • Stick It! Contest

      Stick It! Contest
    • Game Life Contest

      Game Life Contest

    140 Discussions

    Yes, mainly the stair-arm lift and perhaps the wheel lift and inverted helix used in Citadel v2.

    Not sure yet, but I want to get them done before the end of the summer.

    Thanks! I think I will use dickheijboer's double chain elevator lift. I might use your vertical jigsaw lift.

    Do you have pictures of the other path selector with 4 outputs? Or instructions?

    Can you get me instructions for the elements at 1:25, 2:17, and 3:28? I know you are busy, but it would be much appreciated if you could get instructions or lots of pictures for them. I am going to make a medium sized ball machine and would love to have these in it. Thanks!

    4 replies

    I won't make it with those, but yes, I am making a ball machine. The reason I won't use those is there wasn't very good pictures.

    Ya. I got some too. They aern't very detailed but I still made them.