LINKING STORAGE TRAYS

UPDATE:
I've added a frame with a mounting hole so that this system could be attached to a wall. I've not printed one but I imagine it should work.

UPDATE:
I've redesigned the slots that the dividers fit into, they now run across the bottom of the tray as well. Previously I had issues with small items slipping between compartments, this alteration resolves this. I've made the slots deeper and tweaked the divider design. All the parts should now work as I originally intended.

UPDATE:
So I've printed the final four frame sections in order to finish this section of my build off and I've noticed that the sections don't fit very tightly together. They don't fall apart but they aren't a snug fit like they were previously.
I've recently made some mods to my extruder drive to try to improve the resolution and I think the improved tolerance is the problem.
To try to improve the situation I have added some tiny "bumps" to the female mortise areas (they are only 0.25mm high so I don'