The darts holder is very handy, holding four sets of darts, with space for spare flights, shafts and a sharpener. There are two versions: wall mount and not. The wall mount version prints-in-place with a small plate to attach to the wall. The basic version can be attached with double stick tape, or just rely on gravity.
Nothing special for printing …
https://makerworld.com/en/models/41404 is a smaller version that holds 2 sets of darts, plus plenty of room for spares.
Useless fact: the Andy Capp flights shown in the photos go back to my Navy days, more than 40 years old!
Designed in OpenSCAD.