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Tetrahedral Spikey, Tetrahedron

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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.


3D printing settings








0 to 10%

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.

  • 3D file format: STL
  • Publication date: 2017/12/26 at 19:31


Designs 218
Downloads 10.3k
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STEAM educator, learning from and working with K-12 STEAM teachers to explore new ideas of teaching and engagement. I firmly believe ART is at the core of STEM learning or all human learning! I owe my ideas and designs to the hundreds of K-12 children and teachers and university professors I have had the pleasure of working with, in multiple disciplines-- math, science,engineering language arts, social studies, early childhood education and more! All mistakes, of course, are mine! There is no warranty or liability whatsoever implied or explicit behind the designs or ideas. They are all posted for their potential educational values.

When working with children, please strictly observe all safety and health procedures! Please refer to the NSTA safety guides:




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