Broom handle spool shelf

My shelves were full of filament in boxes… practical, but not very space efficient. So I measured my shelves, and had to design three different spool rails, because the shelves have different size spaces. Anyhow, all worked out fine as the flat one is flat. Nothing magical there, the other 2 allow for a regular 1kg spool to be stored underneath on the actual shelf ledge so as not to waste space, and the larger one allows for a box or set of small drawers (A bit higher than a regular spool of fil