This is a twist connector I came up with for a project I was working on. Can be incorporated into other projects as needed. The two parts connect by inserting one into the other at a 90º angle, then twisting counter-clockwise until they click into place. To disconnect, twist clockwise and pull apart.

In addition to the SCAD file, there are 3 STL files:
TwistConnector - a 23mm male/female pair, suitable for embedding in interlocking parts
TCDemo - the same pair, but with tabs to aid in manipulating; also a nice fidget toy
TCCutawayView - a cutaway view of a connected pair, showing how the two should fit together