I wanted a more space saving way to store my combo squares including the protractor and center finder pieces which aren't included in most of the other models out there. This model keeps the main body upright for easy grabbing and eliminates all the extra dead space.  I use [https://makerworld.com/en/models/1032948-straight-edge-ruler-holder#profileId-1016166](https://makerworld.com/en/models/1032948-straight-edge-ruler-holder#profileId-1016166) for the ruler pieces.