Metropolis - Knex Ball Machine Elements and Lifts

Picture of Metropolis - Knex Ball Machine Elements and Lifts
Hello everyone,
I wanted to post a selection of elements that I used in my latest ball machine metropolis. I can't post all of them with step by step instructions. But you should be able to make most parts by looking at the pictures in this instructable.

Table of contents
Step 1: The Official Video
Step 2: Flat Spiral
Step 3: Spinning Basket
Step 4: Five Ball Basket
Step 5: Ball Seperator
Step 6: Rattling Stairs
Step 7: Free-fall Spinners
Step 8: Zigzag
Step 9: Catcher
Step 10: Halfpipe
Step 11: Red Double Spiral
Step 12: Two Ball Dropper
Step 13: Small Ferris Wheel
Step 14: Flexible Path
Step 15: Rollercoaster Path
Step 16: Quadruple Arm Lift - The wheel
Step 17: Quadruple Arm Lift - How to set up the wheel
Step 18: Wheel Lift - The base
Step 19: Wheel Lift - Middle part & Motor
Step 20: Wheel Lift - The top
Step 21: Fast Corner 

Feel free to comment, criticize or ask anything.

Thanks for looking and have fun building!


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Step 1: Metropolis

If you haven't seen Metropolis, go to this link for the slideshow.
Or watch the video here:

Step 2: Flat Spiral

Picture of Flat Spiral
Here's the flat spiral, the ball will roll away from the center. It is very hard to get the orange track right. But it's also very cool to look at :)

Step 1: Make the frame

Step 2: Support the frame

Step 3: Add the track

Step 4: Make the ball's entrance
> I used this ball dropping mechanism

Step 5: Adjust supports and track width
> When you make the path wider, the ball gets more speed.

Step 3: Spinning Basket

Picture of Spinning Basket
I modified this from another instructable. The ball will enter the basket, spin 300° and then drops out of the basket onto the next path.

Credits for the idea go to "yardking"

Step 4: Five Ball Basket

Picture of Five Ball Basket
This basket releases five balls at once. You can adjust the weight by adding or removing wheels.

Step 5: Ball Separator

Picture of Ball Separator
When installed correctly this can be used to allow balls to pass one by one.
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MegaMetal84 years ago
Can you post this one
Kairah (author)  MegaMetal84 years ago
Can't you make it from the pictures? It's not that hard, really... :P
www139 Kairah8 months ago

I built zigzag!

Yeh probably
Tornado964 years ago
Gravity must be different in the Netherlands because I needed a larger weight for it to work... :-?
How can gravity be different in the Netherlands? :-P Maybe your ball machine is unlevel.
nup. I'm pretty sure it's level.
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It works with a stronger weight and everything else is the same unless metallic pieces are heavier or lighter than normal pieces.
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Since 2011, ball halves have gone up 3 cents!!! And that's in 3 years! Imagine what it will be like in 10 years!!

As are all toy companies. : /
It is possible that this could be (there are places in Canada that have less gravity,) but not as likely. More likely, as time went by in the Knex world, the company figured out how to make the pieces lighter and lighter, so maybe you're using the older pieces?
camodei10 months ago

It'd be awesome if you made a step by step instruction on how you made each piece and then put it all together. Hell...I'd pay for it.

yardking2 years ago
Thank you immensely for the credit!
can you post the big ferris wheel??
Kairah (author)  firebombfury4 years ago
I already took it down but here's a large picture of it: link
here are a total of six white connectors in the center of it.
Fr-Pa-Co Kairah2 years ago
I built it but yours seems to spin faster than mine
cooljupjup2 years ago
he ik ben ook nederlands. heb jij fotos van het platform ?
OZKNEX222 years ago
wish i hade that much pieces
radknexman2 years ago
Im so using it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
=^..^= (cat).
Knexest2 years ago
Do you know if it works with the Black/White balls?
O.o Btw i tested this a while ago and they work on this :p
Lego Andrew3 years ago
Can you also use a big gear instead of 2 medium?
try it
Do balls ever fall off the ball machine?
www1392 years ago
Nice job I really like metropolis it has helped me come up with ideas for my ball machine!I don't need help with the path Deviders anymore I was able to make my own!
www1392 years ago
hi I was wondering if you could give instructions on how to make your path deviders?I like them a lot!
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Kairah (author)  rrobinson19992 years ago
Is anything else, besides the ball, touching the basket when the ball lands in it? Or is it off centre?
No, nothing other than the ball is touching the basket. Also, it is perfectly level. It seems like whenever the ball lands on it, it pushes the basket too far on one side causing the ball to fall off. I have tried many adjustments but nothing seems to be working.
Kairah (author)  rrobinson19992 years ago
Hmm, I'm not sure how it could go wrong then. Perhaps you could try to make the basket a little more stable by adding some weight to the bottom of the basket.
Cool, I use that track a lot so that will help.
Oh god I haven't been on instructables in a long time haha :D Sometime last year.
I'll come back...been doing a lot of YouTube videos since I got an amazing computer :D
Fr-Pa-Co2 years ago
"Version blue with blue rods". I think you meant version two with blue rods
Kairah (author)  Fr-Pa-Co2 years ago
Yup, edited :)
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