Barbed Wire! Fun for the whole family! I printed these at a .12 layer height and it barely takes any filament, so when you see that last part on your printer where you can see the cardboard of the spool, this is the perfect print. This print is 11.18 grams. Yeah. 

These should slide on easily but stay in place. If the barbs are loose, just give your filament a little bend and slide the barb over the bend, it should stay in place. You can also glue it if you like. 

There are also crimp-style pieces where you can put loops on the ends, connect them, and wrap them around other things. It's super versatile. 

Have fun!