Rod connection nodes

Simple connection nodes for rods of unlimited length, allow you to create structures of various shapes. The rods do not touch each other, which allows them to be used as electrical circuits when creating devices using the "free form wiring" method. All holes in a tetrahedron are either parallel to one of the edges or perpendicular to one of the faces. The diagrams that I was guided by for this particular design are presented in the gallery.
https://www.youtube.com/watch?v=m4y6-qrzIfQ
https://www.youtube.com/shorts/LPdlgS6PQ28
https://www.tiktok.com/@psv6207/video/7251444184320724230