Ender 3 Spool Holder Support

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5262775.

I really liked the spool holder I saw on CHEP, but mine sags a lot with a new spool on it. Maybe it's my print or material? It worked fine, even with sagging, but the sag bothered me, so I made this support. It works.