Revised Filament Spool Sprocket (Quick Change)

Update: This removes the sharp edges from my original quick change spool holder.

https://www.thingiverse.com/thing:2067525

This spool sprocket is intended to make removing a spool of filament super easy; as easy as changing tires in NASCAR competitions, (well almost). No really, it makes removing nuts a thing of the past. It works with standard 608ZZ bearings or without, your choice. See my spool holder top mount as this is a perfect complement to that thingi but it works just as well with most other standard spool holders/mount. (The bearings were a nice tight fit. Use the power of muscle persuasion or maybe a shop vice in a worst case scenario to insert the bearings.)

NOTE: Why two different Nuts? One nut has threads on only 1/3 of the nut for the quick spin action, thus the quick change in my title. The other nut is fully threaded which takes more effort to put on and remove. By having less threads on the nut, it is really easy to remove and cinch up, almost like a traditional butterfly nut.

Visit http://www.thingiverse.com/thing:2009565 for my top mounted spool holder.