Summary

This is a clip on cover for right-angle fed BNC plugs that is in two complementary parts and clips over the BNC using 5 separate interlocking guides built into the sleeve.It allows the BNC plug to swivel around the socket and is thus useful in directing feed (e.g. 50ohm cable) to the connector.
A short segment of heat-shrink over the sleeve will provide further security if needed.

I printed the two faces with the concave surfaces facing up and using vertical supports.
This tends to keep the interlocking areas in better shape ;)