Sterilite 20 Qt Gasket Box Spool Rack

This is a remix of the Filament Spool Rack for 20qt Sterilite Container by leefla - Thingiverse  which tweaked a couple of elements/dimensions from the original design.

These rack ends are designed to work with 3/8" (9.5mm) diameter aluminum or steel rods to make a spool rack which sits above loose desiccant in a Sterilite 20 Qt. gasket box (P/N 19324306). Amazon.com - Sterilite 19324306 Gasket Box See-Through Lid and Base with Blue Aquarium Latches and Gasket, 20-Quart, 6-Pack - Lidded Home Storage Bins

I found that the diameter of the 3/8" rods isn't well controlled during manufacturing and were typically too big to fit in the holes of the original design, so I redesigned the brackets by making the holes larger and adding splines to allow for a bigger variability of rod diameter.  Like the original design, the rods should be cut to approximately 12-¾" (325mm) long.

Like the original designer, I am also using activated Alumina as a desiccant.  I put about 1lb (454 gm) of 3/16" media in the bottom of each box and it easily keeps the humidity below 10% for 6+ months before needed to be re-dried again.  It can be re-dried in the oven and is more tolerant of higher temperatures than silica.  I usually re-dry it around 375F (190C) for three hours.   When I see the humidity in the box is starting to get above 25% I know it's time to re-dry.  The downside to the activated Alumina is that it is very dusty compared to silica.