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Snap-together polyhedron verticies

by mrule, published

Snap-together polyhedron verticies by mrule Nov 24, 2010

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Summary

update : a revised script and set which includes 4,5 and 6-fold vertices ( slash facets, not sure which to call these ) can be found at http://www.thingiverse.com/thing:4934 and http://www.thingiverse.com/thing:5028.

These two triangular pieces can be assembled into any polyhedron based on equilateral triangles. This includes tetrahedra, octahedra, icosahedra, and many others.

The structure of the pieces is such that they resemble both faces and vertices, so the octahedron is also cube-like, and the icosahedron also looks like a dodecahedron. ( a tetrahedron is self-dual, so that doesn't count ).

Instructions

Print out two each of Y1 and Y2, assemble into tetrahedron
Print out four each of Y1 and Y2, assemble into octahedron
Print out ten each of Y1 and Y2, assemble into icosahedron

A range of other shapes are possible. I believe the C60 buckyball is possible with these elements.

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Maybe I printed too many walls (2) or too much infill (30%), but I can snap them together only under hot water (PLA). They make a very nice connection though. Inseparable (when cold) and frictionless.

mrule - in reply to maxy

No, that's correct. These were designed for the elasticity of ABS and don't really work correctly with PLA.

There is a self intersection where the male connector meets the body. OpenSCAD will not import this file. Can you please either fix this problem of upload the .scad source so I can.

Is this something that can be fixed in Meshlab? I am not sure I can find the original file -- I don't have time to track it down right now, maybe later today. Sorry about the importing problems.

I initally had trouble with netfabb, but eventually it behaved. I have uploaded the files for Y1 and Y2 here: http://www.thingiverse.com/thing:13802http://www.thingiverse.com/thi....

Snap-together polyhedron verticies
by pogden

my younger son took one, so I had to make another. :)

I made a nice structure using these parts, I only used Y1.stl and Y2.stl.

Printed on a UP! printer, (http://pp3dp.compp3dp.com).

-cyberbadger

I guess I made your C60 buckyball!

Awesome!

mrule - in reply to mrule

Did you find the snaps too loose ? I've only printed the dodecahedron, which has more constraints. Its also possible that, since I designed the snaps for my poorly calibrated MakerBot, they expect a certain amount of roughness, and better printers might print them more cleanly, and hence make looser snaps.

They are a little loose, but fine. I also scaled by 1/2, and made a smaller one - here depicted with my gerbil Master Tesla...

This looks very simple and fun. What did you use to do the modeling?

openSCAD

Can you publish the openSCAD file so we can tweak the design?

Cool idea! And nice print quality.

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