A holder for your Nerf Trilogy shells. I printed 10 of them and realized I needed some way to hold them on my blaster.. I ended up velcroing 2 of these onto the side, so they are easily removable. Keep in mind that they do not friction-fit the shells, so if they aren't oriented vertically, shells will fall out. It is advised to place the shell in such that the dart is facing into the holder - so you can't see the tip - as otherwise the rim of the holder will get caught in the shell.