Octahedron-Tetrahedron Plastic Straw Connector

This is a node to connect plastic straws in a 3D repeating octahedron-tetrahedron pattern (a space frame truss).

I put a further design evolution here: https://www.thingiverse.com/thing:3045840

The new design provides a positive stop for the straws, and an internal support cone to increase the stability of the interference that holds the straw in the connector.