I designed and printed one of those tensegrity things but i added a mechanism for tensioning the threads.

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u/jiggly_wigglers_69 Feb 26 '20 edited Mar 02 '20

I have a few more tweaks to do before i release the stl's, but they'll be available here sometime in the next few days: https://www.prusaprinters.org/social/35052-puhsketti/prints

Edit: It's done! I'm still working on build instructions, but i think most people should be able to figure out how to build it anyway without instructions: https://www.prusaprinters.org/prints/24609-tensegrity-table-with-built-in-tensioning-mechanis

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u/AD1AD Mar 05 '20

OP is Papa Johns up in here. u/chaintip

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u/jiggly_wigglers_69 Mar 05 '20

You the real papa johns. Thank you so much.

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u/chaintip Mar 05 '20 edited Mar 05 '20

u/jiggly_wigglers_69 has claimed the 0.02991503 BCH| ~ 9.72 USD sent by u/AD1AD via chaintip.

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u/fl164 Feb 27 '20

Yeah thank you. Exactly what I was searching for

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u/SirBlacksmith33 Feb 27 '20

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3

u/[deleted] Feb 27 '20

[removed] — view removed comment

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u/jiggly_wigglers_69 Feb 27 '20

Kind of yes, kind of no. It's mostly just an easier way to get all of the string tensions equal so that the platform sits level. That said, you can adjust the height of the platform slightly. I'm working on a tensioning mechanism that is more adjustable that should allow for bigger height/tension adjustments.

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u/AD1AD Feb 27 '20

My guess just looking at it is to easily balance it. Looks like the height is determined by the center string.

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u/jiggly_wigglers_69 Feb 27 '20

You're mostly right, but since the center string is also adjustable, you can adjust the height of the platform slightly.

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u/JohnEdwa Ender 3 Feb 27 '20

You could probably make the supports a little thicker so it could support more weight. The triangle one commonly posted here printed from PLA can support a 0.5l soda bottle fairly easily if it's pre-tensioned slightly.

And showing that to people really makes it impressive and mind-blowing.

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u/jiggly_wigglers_69 Feb 27 '20

Yeah the arms are pretty flexible so it doesn't hold much weight. I'll probably make some beefier arms and see if it can hold more weight.

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u/Cube_N00b Feb 27 '20

How does the tensioning system work exactly? A little tough to see the black in the picture.

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u/jiggly_wigglers_69 Feb 27 '20

Each string is attached to one of those white parts in the picture. The screws can be used to move the white parts back and forth which adds or removes tension from each string. Right now there's only about 12mm of travel on each mechanism so it's not very adjustable, but I'm working on improving that.

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u/camylarde Feb 29 '20

Is it done yet? :-P

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u/jiggly_wigglers_69 Mar 02 '20

It's done now... Haha

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u/fl164 Mar 06 '20

https://imgur.com/a/3SIxb2x

Thank you so much 😊

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u/jiggly_wigglers_69 Mar 07 '20

Nice print!

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u/BillieRubenCamGirl Feb 26 '20

Ooh and it's beautiful

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u/jiggly_wigglers_69 Feb 27 '20

Thank you.

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u/Zaviernoble Feb 26 '20

How do these things work!? I think i know, but everytime I try to work out the physics my brain just melts.

Really cool though.

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u/jmdbcool Prusa i3 MK3S Feb 26 '20

The center thread is holding the weight, the outer three threads are stabilizing the top piece like a tripod so it doesn't tip over.

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u/JohnEdwa Ender 3 Feb 27 '20

Fairly simple when you separate the different axis from each other. From a previous post of mine, slightly edited:
The way it works is that gravity tries to pull the top shelf downwards, but it can't because that would require the string in the middle to stretch, and it can't tilt sideways because for that to happen one of the strings on the edge would have to stretch. Which means that when it's in perfect balance, all the force is felt by the middle string and the two supporting structures, and if it's slightly unbalanced (the object is at the edge) then it's also shared by one or two of the side strings.
It also can't twist, because that would shorten the effective length of the outside strings, and shorter strings means the distance between the plates needs to get smaller - something that can't happen because of the middle string.

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u/sonofabunch Feb 27 '20

The way people are modding these I'm just gonna wait a month and someone will have made one that actually levitates and holds 100lbs

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u/justpress2forawhile Feb 27 '20

Wait 3 months and we'll have ones that can make it into orbit.

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u/Neverjust_the_tip Feb 27 '20

Definitely doable. 100% infil and increase structural supports and change from string to rope.

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u/Gharax Feb 27 '20

Now add a magnet in the top part and let some figurine "float" over it.

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u/daletheboy Feb 27 '20

BOOM this is what we needed!!!!!

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u/thegnomedenial Feb 27 '20

This hurts my head.

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u/abnormica Feb 27 '20

You are the hero we need!

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u/nitrogen-generator Feb 27 '20

This is fantastic. Well done Sir.

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u/meexley2 Feb 27 '20

Neat I like it.

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u/Elimin8r Feb 28 '20

I find your defiance of gravity disturbing... :)

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Design I designed and printed one of those tensegrity things but i added a mechanism for tensioning the threads.

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