Summary

kelvin coupling or Maxwell kinematic system

Got inspired from the E3D talk:
Tool changing 3D Printers by Sanjay of E3D
https://www.youtube.com/watch?v=DRkF-D0fEbQ
enjoy...

Print Settings

Printer Brand:

Prusa

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Prusa Clone</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                        <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>I print the each of the 3 parts top, bottom,and latch one at a time, but the is a print file with everything together.</p></div>

How I Designed This

Its all done in OpenSCAD worked out the polyhedron in inkscape see the svg or pdf copy if you like this sort of thing.
I know I could have just used another cube rotated difference to do the same thing, but thought this way more interesting.

The latch is just a manual part to play with, It holds the two parts together,
I wonder if some form of screw would be better?
Its sort of a work in process so any remixed comments etc.. welcome.

Custom Section

if you want to change the shape of the connectors, you could just change the module connect() and or plugs(),
see connect_example() in the scad file.