The dividers look to be full height of the toolbox (not layered trays), so why are they printed as a separate part from the toolbox? Not knowing 3D printing, m

The dividers look to be full height of the toolbox (not layered trays), so why are they printed as a separate part from the toolbox? Not knowing 3D printing, my first guesses are that dividers can be done in a different color (to have high-contrast with the contents), or different material/process (for different outside/inside requirements), or to facilitate reconfiguring an existing box for different contents (lower cost to print just the divider insert, than to print an entire box and add metal hardware)?