This is a parametric model of a case I designed to fit my micrometer in a gridfinity grid.

The model was created in FreeCAD 1.0 with the awesome Gridfinity Workbench, version 0.9.7.

While it started out fully parametric, I got a bit lazy along the way, so you might have to adjust some features (such as the position of the recess for easy removal with a finger) manually.