I needed to organize my tools so i designed some tool holders designed to be mounted vertically.
This holder has flexible slots that can hold allen keys upp to 5 mm, but it can also hold other tools like small screw drivers etc. let me know what you used it for :)
This also have notches for possible add ons.
Needs a filament that can flex slightly without breaking as the tools are jammed in between the tabs. May not be suitable for PLA, but i haven tested that.