Customizable dowel holder (dry box, filament rack, etc)

A customizable dowel holder for use in making filament dry boxes, filament spool racks, stands with racks for the Mosaic Palette+, etc.

I've included 2 premade stls. The "-dry-box" I used to make a filament dry box to hold nylon / pva and it holds a 1/2" aluminum rod purchased at a hardware store. The "-screw-mount" I used to hold the same 1/2" aluminum rod to make a stand + filament racks for my Palette+.

There are two parts to the holder. A "flange" is (optionally) placed below the br