I used the realy nice parametric rugged box model from @Whity on Printables to create a box to contain my router collets of my Triton TRA001 router. I now have a beautiful case to safeguard them in my tools drawers. The inprint on the lid makes it immediately clear what is in it ;-)
The box can contain the available router collets. The lid is thick, but that is due to the minimal required height for the lid of the original model.