This is my second part. It is a box with tongue-groove joint. Its size can be customized, so you can create a kind of organizer for screws/nuts or electronic parts or any other things.
The base file is a OpenSCAD file, but I also include some STL examples.
Created with OpenSCAD (2015.03-2).
These parameters should be modified before creating STL file for each box:
// base length
bl=30; // at least 20mm
size (external) of a 1x1 box
// base height
box height (external)
// box multiplications
Specify how big a single box should be (multiplication of a basic box)
// tongue&groove elements
xt = true;
xg = true;
yt = true;
yg = true;
Outer boxes probably should have no tongues or grooves. Here you can disable any of them