There are many spool holders out there. The problem is there are many spool sizes that makes it hard to build a universal one that works well. I decided to make a spool holder that mounts horizontally and uses the weight of the spool itself to keep the spool in place.
This is version 7 of my design, it’s still in progress and was a good motion study for the joints in CAD. How will it work in practice? We’ll soon find out.