Organizing clip-socket-corner thingy

Socket that i made to clip different cardboard sheets together. Working on a stop-motion project at the moment so i am developing ways to build the sets as easy as possible, taking into account that they must be of easy-assembly and disassembly. That´s why i made this 3-way socket that can clip 3 cardboard sheets together and make corners to build the apartments for my stop-motion sets.I am currently working on another full double 4-way socket with a middle section to attach perpendicular sheets to make different floors with a lesser amount of clips in use.Stl and 3mf files are set for the spaces in-between to be 4mm thick, simply enlarge the or make the whole model smaller depending on what thickness you need