Caliper Sliding Tray Storage

My model neatly stores 6" Neiko digital calipers, a very common tool in the 3D printing hobby.  The caliper tray slides over the two lower storage areas and has raised areas to lift the calipers off the tray, making it easier to grab.  The top tray can also store a few supplies, like pencils and markers.  

Even though the model is parametric, I included stl files.  They are available in several overall heights with 2.4 mm wall thickness and 2.4 mm base thickness.  The tray takes up about 22 mm of height, so the usable height in the lower compartment will be smaller by this amount.

If you want to customize walls, height, or remix for your own caliper, I have included the f3d file.  The sketch and extrude process is fairly simple, and the variables have descriptive comments.  

https://www.amazon.com/Neiko-01407A-Electronic-Digital-Stainless/dp/B000GSLKIW/

Thanks for visiting, and enjoy!

Minor update: I shortened some of the extra length (around 4 mm) to make the tray more compact, and corrected an extrude calculation (by around 1 mm).  I also added step files.