I liked some of the designs that used a funnel to direct the wire coming off a spool from the area covering the spool down to a very narrow area to feed to the tensioner. I also liked the use of felt pressing against the wire to provide back tension on the wire feeding off the spool. This was my attempt to combine those two ideas.
The printed channel both forms the funnel, and allows for a top pad to press the wire into the felt. I need to make a custom jig to hold the magnets while winding to really put it through its paces, but it seems to work.