Today I designed and fabricated a new parametric spool to wind up my addressable fairy/pebble/seed LED light strands. This one holds 40 meters of lights which I use for trail lighting at outdoor events. I use it in conjunction with battery-powered WLED controllers for fun animated trail lights.
It's open source and free to download/remix here: https://www.printables.com/model/1300796-led-light-spool-customizable