Want to carry some spare blades with you, but don't want to lug around the entire box?
Or maybe you want to have a hook blade, and a standard blade on the go at the same time

There are 2 latch variants, the original hinged latch, and the new pin latch
The original is a bit nicer to look at and easier to open, but can pop open when dropped, and requires support material on the body and latch
The pin latch requires no support material, and is much more durable, however you will have to find or bend a pin to fit it (the holes are sized for filament, but I don't recommend it)

This case can hold 7 blades, and has an indent and ridge to prevent them from falling out the side if your print warps slightly

The tolerances are fairly forgiving as well, and should work decently even if your printer isn't tuned perfectly (if a printer from 2015 can print it yours probably can too)

The hinges are held together with regular 1.75mm filament melted at either end, however the holes will likely need to be heat formed to the right diameter (this was done to add a nice amount of friction to keep the lid from flopping around and definitely not because I didn't want to fiddle with a part that works well enough)

The case is quite sturdy, and the hinge(s) can survive a drop onto hard surfaces from chest height (depending on filament and quality of print)