Adapter to fit various large thread cones (4500m, 5000m, 9000m, 10000m etc) to your thread stand or sewing machine, as long as it has a spool pin long enough to support it, and that pin is smaller than ~6mm diameter, it will fit.

I designed this for the Prym thread cone stand, as I didn't think the original pin it uses were a great way to support larger thread cones.

I have only tried it on a handful of different thread cones I had on hand, but it works well on all of those.

It should be printed on a material that allows for some flexibility and doesn't creep. I used PETG with great results. It will probably work in PLA, but lose spring tension much faster over time.