A simple alternative for adapting your spare spools for overture's cardboard spools. This one is designed to be made with TPU and it's not the full width of the spool because it's not necessary for it to be so to work. However feel free to scale it up if you want it to be so.
How to use this:
Tip: Check the photos to see an overview of how to use the adapter.
I printed mine with 90A TPU so its pretty soft.