Filament Spool Upright Shelf Storage Block

I created these simple filament spool storage blocks for storing filament spools upright on a shelf.

I uploaded three sizes, 52mm, 75mm and 90mm, which were the spool widths that I had at the moment. There's also two versions of each STL-file. One version with a solid body and one with the middle part cut away for faster print times and less filament usage.