Tetrahedral Racks with Endcaps and Pins

Based on Henry Segerman's second version of tetrahedral racks. I used his original model combined with what he showed on his v2 video on youtube and made this version which has end caps that fit into pins placed at the end of the prongs. Please note this is not the model demonstrated in his video, but it is my attempt to make something similar.

Youtube:
https://www.youtube.com/watch?v=h2sgGvcCydk

Shapeways:
https://www.shapeways.com/product/HZYZS22E5/tetrahedral-racks