This is my try on a spool shelf that use 27mm rods.

Like a said, it is made for rods that is 27mm in diameter so its strong and can hadle alot of rols on just two hangers. The size on screws can you see in tha last pucture, it´s the smallest of them i use.

I made one of the hangers so its can handle more weight in a corner. Look a the pictures and you see what i mean.

Hope you enjoy my design.

Cheers