DK's Filament Dry box

so I always store all my filament other than ABS in a dry box and when I saw this container at wal-mart I figured it would work for holding a spool after a few designs and all I had a dry box I like it has a option to use a cotton ball or two for filament cleaner oiler as I always use one on my filaments. you can use the center part with 608 bearings if you would like of a simple piece of PVC pipe will work... I use both.

It's set up for 9 m3 bolts I think they where 6mm long but not 100% s