I needed a way to store my commonly used wires so I can quicly grab a needed lengh of wire.
The only spare space I could find was under the shelf.
The spools hang on a 8mm steel rod that is commonly used in many 3d printers and that's what I had.
A designed spools that are easy to print and snaps together with friction of layer lines. Even though the two halves holds pretty good with friction I recommend to apply a dab of CA glue.
I've included a number of different spool sizes but it can easily be adjusted in FreeCAD model as a single parameter in a table.
The spools features hooks and holes to secure ends of wires.
The author marked this model as their own original creation.