Filament rack with 1" (one inch) diameter dowels. Tolerance is tight, so I needed to use a mallet to tap in the dowels. The mounting hole from the original model worked fine for me with #8 wood screws.
Printed with 4 walls, concentric top surface, 20% gyroid infill.
The author remixed this model.
Remixed to use a 1" (inch) diameter dowel.