Another wrench holder. Also sturdy and even more filament-saving.
Not better or worse - just a little different from the previous one.
It's for these [metric] sizes:
6+8, 7+9, 8+9, 10+11, 12+14, 13+15, 16+18, 17+19
The sizes can be customized in the scad-file.
Slide the closure over the holder several times before inserting the wrenches. It should fit tight.