This is a Spool Holder for the thing "Modular Spool for Cables, Wires, Rope, String, Lace, etc.".
The modular spools can be found here:
https://www.thingiverse.com/thing:5023560

You will need 14mm wooden rods as cross connectors and as holders for the modular spools. Maybe also 12 or 13 mm rods will work also. 15mm rods are too thick and won't fit in the modular spool thing.
You can cut the wood rods to any length, which fit's you needs

There is a single (1 crossbar) and a dual version (2 crossbars).
With the single version, spools with a diameter of 100mm can be used and with the dual version, a maximum of 60mm can be used at the bottom and 50mm at the top.

For the dual version you need 5 wood rods and for the single version you need 4 wood rods.