This is my K'Nex knife sheath. It fits over the shoulder. This is my first instructable, and I think it's pretty good. It's compatible with any K'Nex knife with a blade 1 connector thick (i.e. a tan connector).
Step 1: The Sheath
Step 2: The Shoulder
Step 3: You're Done!
You're done! I hope you liked it. Now you can show your friends your awesome knife scabbard.
I did some mods to the original scabbard. One was complete shoulder armor (shown in pic. 2), and one was a double sheath. It's easy to make. You make two more sides (you made these in the second picture in step 1). Instead of using blue rods to hold it together, you use yellow rods. You then add any amount of spacers from 2-4 blue spacers between them. Add one side, a silver spacer per rod, and one more side.