Turner's Dodecahedron




In this Instructable I will show you how to create a Dodecahedron (12 sided platonic solid) using Pro/Creo software. The topics i use and the techniques that are demonstrated can also be applied to other CAD/CAM software's. The original design for this object was based off of a challenge that was presented to apprentice machinists. They were given a cube which had three or four smaller cubes within it, they were all free to move about but could not fall out. I have taken this concept and expanded it into a more complicated and more advanced shape.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1:

In this step the  bottom half of the dodecahedron will be created from 6 identical pentagons. The links bellow will show you the step-by-step method of how to create it.


Step 2:

Here I will be showing you how to properly mirror the bottom half and make the object a complete solid. Again the bellow link will direct you to a more detailed description.


Step 3:

In this last step I will explain how to create and use a simple User Defined Function to simply and easily place the patterns of the holes. The bellow link will take you to the final step-by-step video. Also bellow are the dimensions for the four holes as promised in the video.


As mentioned in the video's here are the dimensions for the holes:

Smallest ----> Largest

0.5" Dia, 2.25" Depth
1" Dia, 1.5" Depth
1.5" Dia, 1.15" Depth
2" Dia, 0.75" Depth

Step 4:

The final product was printed using a Rapid Prototyping machine at my school. This print too approximately 36 hours!!! Please post any questions you may have or any of your own alterations/final products! Enjoy.

P.S. I have also attached my .prt file and the holes UDF that I created in the video. To use these they will have to be in the same working directory as one another.

Make It Real Challenge

Participated in the
Make It Real Challenge

Be the First to Share


    • Made with Math Contest

      Made with Math Contest
    • Cardboard Speed Challenge

      Cardboard Speed Challenge
    • Multi-Discipline Contest

      Multi-Discipline Contest

    4 Discussions


    7 years ago on Introduction

    Very nice.

    If you take a sharp blade to it and start with the smallest dodecahedron, you can cut each one free from the next one and end up with a dodecaherdon within a dodecahedron within a dodecahedron, etc, etc..


    7 years ago on Introduction

    Rhombus! This is a truly awesome project, worthy of any DM's brigade.

    Thanks! I used used a 3D printer to make it, it just uses cartridges of PVC plastic and it lays it down in 0.003" layers until the model is complete.