This is a simple modular spool holder. Each “Rib” (I didn't really know how to name the parts) can hold either an “End Link” or two “Link”s. This way, you can print and use as much as you need and make it whatever length you need!

The socket in the “Rib” is 5mm in width. An “End Link” has a 5mm width plug on one side and 2.5mm on the other. A “Link” has a 2.5mm plug on both sides.

Feel free to modify and rework but remember to credit! :)