Triangular Bipyramid, the convex deltahedron with six faces
Pieces required: 9 ZipStix and 5 zipties
1. Build a regular tetrahedron, leaving the junctions somewhat loose.
2. Link three additional ZipStix together at one end.
3. Release the zipties at the three corners of one face of the regular tetrahedron, without sliding the ZipStix off of the zipties. Add one free end from the group created in step 2 to each of these corners, and then zip them back up again.
4. Pull all of the connections tight.