Hello everyone! After over a year, it's finally finished: my Knex skeeball machine! This machine is full-size, coin-operated (takes quarters), turns itself off automatically, and counts points using a mechanical counter. And, all of it is mechanical, using only normal motors to power it (no CyberKnex motors). There are six motors used in the machine; four of them are used for just the counter. The only non-Knex parts used are a few rubber bands and the paper for the counter.

The video below shows the machine in action!

This game is a lot of fun to play, for me and my family (my dad has the highest score, over 400 points). I've only scored in the 1000 point hole 2 times, and I haven't seen anyone else score that one, so it's very hard to get the ball there. Playing time for one game is about 1:30, plus how long it takes to throw eight balls. 

Note that my camera lens makes things look curved, for example the ramp in picture 7. Insides of the machine start at picture 17.

Fun fact: If one were to buy enough new Knex pieces to build this, the cost would be around $4,391. The piece category that costs the most money are the yellow connectors, which would cost $835.

I will not be making instructions of this whole machine, but I have made other models that use mechanisms from this machine. These smaller models do have instructions, so you can still build some of the mechanisms used in the skeeball machine.
  • Leave Me Alone Box uses the same motor mechanism (the one in the box is more compact than the ones used in skeeball). 
  • Coin Sorter V2 uses the same coin sorting method found in the skeeball machine.

Started building: May 24, 2011
Finished building: July 26, 2012
Width: 26 & 3/8 inches (67 cm)
Length: 85 inches (216 cm)
Height: 57 & 1/4 inches (146 cm)
Pieces: 28,396


Direct video link

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ThijsL15 days ago

have you mayby instructions of THE coin meganisme?

Mickeyriffe4 months ago
you have too much time and money.....
Gold Chucky4 months ago

I have heard that you stopped building with K'nex. Is that true? You kind of made history... And if you are, what are you doing with all of your K'nex?

Shadowman39 (author)  Gold Chucky4 months ago

That's sort of true, I still have Citadel up but haven't built anything in a while, just haven't had enough motivation I guess.

Monkeys114 months ago
When are the instructions coming out
First off I can't think of a word great/powerful enough to describe this, secondly why have I not seen this until now, and thirdly please please please tell me your pursuing a career in engineering. If you can build something this complex with Knex imagine what you could do with custom pieces.


None of the above can describe how freakin amazing this thing is.
Shadowman39 (author)  Lucas The Boss5 months ago

Haha, thanks! I tried mechanical engineering but I didn't really like it that much, so I switched to computer science.

knexfun1017 months ago

I wish I had enough knex to build it. It is really amazing though! : )

Shadowman39 (author)  knexfun1017 months ago


Gold Chucky8 months ago

That is so cool! I have always been a fan of your creations, and this just makes me go what the heck! Your creations make mine look lame :(

Shadowman39 (author)  Gold Chucky8 months ago

Ha, thanks! Also, welcome to Instructables!

Monkeys1111 months ago

Can you please make directions. My mom loves skeeball and every time I see this I would think that it would be the best birthday gift ever . It is the coolest knex creation I have ever seen. You are a genesis. It would definitely be a lot of fun building for me and the best thing I have ever made! You should think about! I hope you do make instructions! Thanks so much!

Shadowman39 (author)  Monkeys119 months ago

I actually am thinking of making instructions now, but I'd want to redo lots of the machine to make things work better (for example, making a counter that uses one motor instead of four). But, that will probably take a while, as I have other projects that are keeping me busy at the moment.

That's amazing. I'd love to see it when you're done with making it. Keep me updated on the instructions. I hope I can make it cause that's the coolest thing I've ever seen.

Where did you get the green gears? Knex User Group?

Shadowman39 (author)  knexinventions 491 year ago

No, I called the Knex company and ordered over the phone.

Well, you should try K'nex User Group. They sell pieces at a really cheap price.

They don't sell large yellow gears, newer sized knex balls, purple rollercoastertubing,purple connectors, dark blue 3d connectors and dark blue rods, that's why I buy my knex second-hand.

Shadowman39 (author)  akshat210451 year ago

I actually don't like that site so much, because for most pieces they just redirect to the Knex.com site (I use the US/Canada site). But, I am happy with the plugin motor that I got from there.

Oh yeah, I forgot. I used the international button coz I am in India currently, and I bought around 1100 pieces for 60 pounds. Otherwise, on K'nex.com, I would have got less parts (around 900) for 120 Dollars. That totally sucks.

Of course Ebay is the cheapest source other than garage sales (JonnyBGood bought 5000 pieces for 20 bucks), but I ain't gonna trust them.

Shadowman39 (author)  akshat210451 year ago

At least with garage sales you might get to see the pieces before you buy them. I had to return white rods that I got from Ebay because they were dirty and discolored. Of course the seller never mentioned any defects and provided a picture of only one of them, which looked perfect.

thijs19021 year ago

i am bizzy wich a micro version of this skeeball machine

Shadowman39 (author)  thijs19021 year ago


thijs19021 year ago

i have a document

with this name:

knex skeeball machine by this cool guy that I appreciate

Shadowman39 (author)  thijs19021 year ago

Haha, thanks :-P

thijs19021 year ago

have you any instructions of the gears

Shadowman39 (author)  thijs19021 year ago

No, sorry. :-(

thijs19021 year ago

I understand not only how the gears work the rest is

thijs19021 year ago

how many engines are in it and I think you are the best with knex

Shadowman39 (author)  thijs19021 year ago

There are 6 motors. Thanks!

Monkeys111 year ago

I really want instructions!

Can you make a mini on with instructions

I doubt shadow will. He is currently building a ball machine: Citadel.

You2131 year ago
This is crazy awesome and takes dedication and engineering skills GOOD JOB!!!!
Shadowman39 (author)  You2131 year ago

Thanks! :-)

Were You Buy Your Knex Please Tell Me
Shadowman39 (author)  EliteKnex1011 year ago

I buy them from Ebay.

Shadowman39 (author)  EliteKnex1011 year ago


He made a Skeeball machine just like yours. Compare the avatars

Derp! :-)

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