A shotgun ammo holder, attached to a belt. I made this model for a friend. He says it works very well. The ammo slot is 20mm in diameter and 61mm deep. The hinge connection holes are 2mm in diameter. There's a finger notch at the bottom of the cartridge holder (a suggestion from a friend who uses this) to make removing the cartridge from the holder easier. I connected them with small nails, but everyone can use something different. I don't recommend using lengths of filament, as they aren't strong enough. There are two types of cartridge holders: one standard, the other with a belt attachment. I decided there needed to be two types because connecting more than four cartridge holders together can cause them to protrude from the belt. The two types of holders allow you to freely extend the set without risking the entire holder protruding. The files are not set in a fixed position; everyone should arrange them for printing in a way that suits them best.