These models divide the trays of Perel organizers (OMRC13) into halves or quarters, this allows for more efficient storage of small parts. You need to import the STEP or STL files into your slicer and print them with 0 top layers, 0% infill and 1 or 2 perimeters. Pay attention to the corners to orientate the prints.
The model doesn't fill the entire space because of the lid: it is recessed and collides with the inserts otherwise.
The author marked this model as their own original creation.