Filament Shelf
thingiverse
The holes have a diameter of 24.5mm, so it is possible to use a broomstick as you can see in the picture.
Download Model from thingiverse
With this file you will be able to print Filament Shelf with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Filament Shelf.