Toilet Paper Spool

I had a bundle of twine that I found on the side of the road about 4 years ago. I have used bits and pieces of it through the years, but it seems to always be tangled up when I needed to get more twine off. I printed these caps so that they will friction fit into a toilet paper roll. Now I have a spool for my twine.

I designed it so that you can use a pencil as a spool holder. Because this is fitting onto a cardboard roll, it won't always fit tightly. Therefore, you could also run a threaded