I needed a way to hold few spools of wire so I made a spool holder and a rail which can hold up to 8 spool holders.

Holders are made for these spools: https://www.printables.com/model/656947-wire-spool-1mm by @AFKFelix_1479300. These spools can hold up to 5m of the thicker 0.25mm2 silicone wire (24AWG) or a lot more of thinner wire

I mounted it underneath my soldering iron stand (an old moveable telephone stand for offices) but it can also be placed on the desk.