Instructables
Picture of Pentagonal High-Tower Spring
Today I'll introduce you a spring with telescope function. You can stretch and squeeze it.
There is an octagonal version of this model by 'oschene' (he is in my followers list) and I wondered if it's possible to make a variation of this model (pentagonal or n-gonal). And yes everything is possible if you don't give up.
The CP is simple to understand, it repeats the same pattern again and again. The only difference is the reversed folding process (mountain folds instead of valley folds and the opposite) between spring structure and frame.

The steps are very similar to my last instructables ('How to fold a Polygon', 'Pentagonal Antiprism Lampshade'). 
So let's get started.


 
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Step 1: Preparations

Picture of Preparations
You print out the crease pattern fullsized (attachment below) and bring it to the right format (cut the black borders off).
Then you precrease and prefold everything like shown in the cp.

-Blue is mountainfold
-Red is valleyfold

Step 2:

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The glueing area is marked on the right side of the CP as dotted lines.
Glue and form the prefolded paper into a high tower.
 

Step 3:

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At first you begin with the frames on both sides.
Please visit my last instructable (Pentagonal Antiprism Lampshade) to find out how to fold frame. 

Step 4:

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To fold the mechanical spring you begin from outside to inside (middle).
You need both hands to fold from both sides simultaniously and you reach the center of the spring. It's a folding and twisting in opposing directions.

Step 5: The Result

Picture of The Result
squeeze.jpg
6.JPG
short.jpg
stretched.jpg
disorder.JPG
As result you'll get a spring that can be stretched in 7 steps like a telescope antenna.
Good Luck and Happy Folding!
Joseir27 days ago
perfect
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adale1231 year ago
wow! this is incredible stuff!! How do you make this stuff!?!?
sphere360 (author)  adale1231 year ago
by studying and gaining experience. When I study the folding patterns, it's like reading between the lines.
Nice. You are awesome. :-D
This was fun to make, although through trial and error I ended up throwing the first couple away. You say that it is easy to port this to a n-agonal shape. How? You mentioned 'oschene' for an eight sided. and you have what looks to be like a 20 sided in your picture, what is the folding pattern for these?
sphere360 (author)  thinking2471 year ago
@maximzodal, thinking247
It's an 18-sided spring on the left side. In my another instructable I gave a hint, how to modify the number of the polygons:
http://www.instructables.com/id/How-to-fold-a-Polygon-featuring-Pentagon/

maximzodal1 year ago
Second all the comments. Just cleaver and neat. My granddaughter left a pile of paper balls on the floor in her impatience. I too would like to know how you would design and 8 or n sided bellows? There must be some math involved here but my geometry is many years hence.
s.pizzle1 year ago
Awesome i just made one of these. really good instructable. fun to make as well. great work!
kurbads1 year ago
Put one end to your mouth then blow out an suck in air rappidly :D !!
Wunderschön!!!
jgscott9871 year ago
Raise your hand if you balled yours up and threw it in the garbage because you couldn't get the folds right...
realife111 year ago
Put an LED bulb in there (so there's no heat and no fire hazard) and you'll have a lamp.
You could even use black and white printed images on the paper before you fold it.
srivastav1 year ago
it would be great if there's a video demonstration,,
i'm stuck in folding Part :(
foobear1 year ago
zomg! so much lamp potential!
WOW I really can't believe how much skill you have...this project is amazing!
"Origami Spring" would be a good band name.

I think this has practical applications if made in plastic with cut hinges instead of paper and folds. The hinges could be easily cut with CNC or even just die stamped in production. It would certainly make a good replacement for various type of "boots" that fit over this or that piece of moving machinery. It could also replace some types of air hoses. By cutting the hinges asymmetrically, you could probably make it bend and arch in a very specific pattern which could be very useful. 

If you made it from a laminate of a rigid exterior with a springy and flexible interior, you could make a very large and powerful plastic spring. That would have a LOT of applications. 

Keep folding.
quinn1 year ago
Great tutorial. Thanks for sharing this!
It appears that given the same size sheet of paper, the greater the value of n:

1. ...the more open space there is available inside the spring-like tube when it is compressed.

2. ...the shorter the final spring in total length, compressed and extended.

Does that seem correct, or am I missing something.

That would be good to know if one planned on making this as a cover for something.
^okay if it doesn't matter i will disregard what you wrote thx.
Nice i-ble. It appears to reach much more than 200% of squeezed size! 200% is only double, and im guessing it's 30x larger or more!
sphere360 (author)  angelgabriel1 year ago
Yes, I've written over 200%, but it doesn't matter.
Hi, this is the first of your instructables I have seen, but it won't be the last. Just superb!
It clearly takes a lot of practice, but your instructable is clear and entertaining.
MANY MANY thanks for sharing.
sphere360 (author)  cobourgdave1 year ago
Thanks for your feedback and yes you need some practice and patience to fold this model, but as I said nothing is impossible. You have to be very precise, when you fold these lines. In one of the next instructable I'll show how to precrease to make precise folds.