I recently got a bunch of wire that didn't come on a spool. Figured I would re-use some old overture filament spools to hold it. I then made a divider to get two colors onto a single spool. I put three of these on a single spool and just hot/glue or super glue into place. I also put some extra holes in the dividers to give more spots to stick the end of the wire through.
I put mine on a table undermount PVC rack for easy access and pulling out of the wire.
Printed with:
0.4mm layer
100% infill
0.6mm Nozzle
Can really be printed with any settings though, no support needed.
The author hasn't provided the model origin yet.