I 3D printable knife scabbard for a dagger. It was specifically designed for a Combat Commander dagger by United Cutlery.
This scabbard consists of 4 pieces and is meant to be assembled using paracord, rather than screws or rivets, though you can certainly use them if that is your choice. The belt loop will require two 3mm self tapping screws for assembly, but that is all.
Very functional and may fit other daggaers of similar profile: 5-1/4" blade length.
This scabbard relies on friction to hold blade secure, so I wouldn't recomend wearing handle down, though it can certainly be used as such.