Make yourself some socket set organizers! Customizable, modular organizers are a great application of 3D printing.
Build video can be found here: https://www.youtube.com/watch?v=rA8MS190tGc
This customizer is a set of socket organizers designed in OpenSCAD for storing socket sets of all shapes and sizes compactly and conveniently in your toolbox. The idea is to use a rail of metal or wood and print socket holders that slide along the rail. The OpenSCAD files can be adjusted for rectangular or circular cross section rails of any size, as well as any drive size sockets. Default STLs are included for 1/2", 3/8" and 1/4" drive sockets, with either 1/2" by 1/8" rectangular rail or 3/8" circular dowel.
Printing the organizers horizontally with 100% infill should provide the best strength but they are printable in any orientation. I used PLA which is fine for regular usage but a more durable filament may be better for longevity.