Update 2: Added a filament guide. Since the spool now sits a little further over the Mini, I was having some awkward pulls. The guide is a definite help, otherwise, I'm thinking, next update will be to make the arms reversible so it hangs either over or away from the Mini.
Update 1: Adjusted the tightener threads (the screws) also they're a little bigger, fit better into the holes and screw together better.
Also widened the hole in the arms for those screws as well. If you already printed them, a quick sanding should widen them up for the newer screws.
Print with about 15% infill, and three walls would be best.