The Gerber Principle knife comes with a clever modular sheath that allows the user to choose between two different types of belt loop, and they attach to the rest of the sheath using a locking plastic spring fork.
The one I bought was the demo behind the glass at the store, and the part was missing from the packaging, so I figured I would recreate it and make it available for whoever lost theirs.
I recommend printing out of PETG for flexibility and durability. Print laying down with logo on top.
The author marked this model as their own original creation.