String Spool Holder

This was designed with a few things in mind.

First: Relatively minimal amount of material (to do this I opted to use string for a portion of the support between the two printed pieces).
Second: Accessibility to individual spools (I wanted the ability to easily add or remove spools which were not in use without the need to displace more than one spool at a time).
Third: A way to prevent spools that were not in use from unwinding everywhere.

One additional consideration was the ability t