A variant of the popular IKEA SAMLA filament storage box that uses 608 bearings to allow the dowel/tube with spools to freely rotate.
Fits dowels/tubes of 18-32mm in diameter. The included drill jig is for 22L SAMLA boxes.
Note: This works great with a single filament output from the box, but with multiple outputs I recommend a different setup such as this one. See the comments of this thing for why.
I recommend these clips for the lid.
Full instructions can be found here.