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Tetrahedral Spikey, Tetrahedron

Capture d’écran 2017-12-26 à 18.58.40.png Tetrahedral Spikey, Tetrahedron
Tetrahedral_Spikey.stl Tetrahedral Spikey, Tetrahedron
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  • Tetrahedral_Spikey.stl

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Publication date 2017-12-26 at 18:31
Design number 18938
LGBU

LGBU

3D printer file info

3D model description

Tetrahedral Spikey: Each side of the big triangle is about 86mm. A raft would be necessary for printing; support is not needed.

Starting with an equilateral triangle, one can extrude at a tapering angle of -19.4712 degrees (arccos(1/3) -90 ) for a tetrahedron, and then continue to extrude in the same way each central triangle (1/4 of the initial triangle) on the four faces. This is a simple and meaningful design project for inviting students to explore the world of 3D design. Of course, a touch of trigonometry would be useful, too.

Warning: The spikey can be dangerous for small children. Please consider flexible filament when possible.

References:

https://en.wikipedia.org/wiki/Tetrahedron
http://mathworld.wolfram.com/Spikey.html

3D printing settings

Rafts:

Yes

Supports:

No

Resolution:

0.15-.2mm

Infill:

0 to 10%

Notes:
Trying stop printing at a percentage between 50% and 90% at 0% infill, see what happens.

How I Designed This
Extrude at a tapering angle of -19.47 degrees.

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