cuboctahedron

Approach 1

cuboctahedron Approach 1

1. Begin with a cube
   
   

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2. Select the line tool and bisect a plane:
   
   
   

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3. Connect the midpoints on the face:
   
   
   

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4. Select the eraser tool and delete the vertical and horizontal line segments
   
   
   

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5. Connect the midpoints on every face:
   
   
   

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6. Delete the corner pyramids
   
   
   

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7. Color the planes
   
   
   

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8. If you SHIFT+click on a plane with a color selected, all the planes of the same color will fill with the new color:
   
   
   

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Approach 2

cuboctahedron Approach 2