Simple and sturdy filament spool holder designed to fit nearly all spool diameters and widths.
The square base design flexes more than the single cross member design but my wife suggested that a square base could also be used as a book or notebook holder or for other purposes.

The 37 mm diameter rod raises the height of the spool so large diameter spools don't rub on the base.
The 33 mm diameter rod may be useful for spools with a smaller diameter center hole and to lower the center of gravity of the spool.
For faster printing you can increase the base speed to 80 mm and the travel speed to 150 mm and drop the infill to 5-10%
If you want to make the holder more attractive you may want to use rainbow colored filament.
Happy printing.

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