Here is a modular container that has a twist lock mechanism. Originally designed with 2mm “snap” features, but it was too difficult to twist into place. Modified to 1.5mm and works much better.  My purpose was to sort my screws, nuts, heat-set inserts, etc, of different sizes, all in one place. When I am assembling prints I just unstack this setup and set the containers I need in reaching distance. When I'm done I stack them all back up, lock them into place and toss the entire thing in my storage drawers.

Designed this with wings that will allow a .4mm label to be printed with text of your choosing. The there is a slight emboss and the “wings” hold the label in place. If you do not want to use this feature, I also uploaded a step file of the body that does not have the “wings”. The emboss is 19mm tall, which accepts my ¾" vinyl labels from my Brady BMP-21 PLUS label maker.

This was made to be modular, so print as many of the bodies as you want to stack them up. The lid and the base will also twist together for a smaller solution.