Print in orientation shown in the .stl file with full supports. Holds a set of spanners from 6 to 17mm in a low profile package, while simultaneously allowing the user to read the sizes. The spanners are also staggered in a way that should allow the user to pull the one they need easily(ish).

The attachments for the jaws are deliberately nominal size and will print slightly oversized due to the orientation. This generates a bit of a friction fit to hold them in place (and if it's too much friction, you can remove a bit of material by a method of your choice.

I designed this to fit my set of spanners nicely, but it should fit other standard types. If not, primarily if the jaws are too thick or too thin, the FreeCAD source file is provided for you to modify. The thicknesses of the spanners are recorded in the column B of the spreadsheet contained, and it should be enough to enter your dimensions there (up to a point, with weird shapes you might get an interrupted model with parts missing out of it.