AEG hubs (often called bobbies) are used mainly in European recording and broadcast studios to store audio tapes. It's a system, where the tape is wound on hubs instead of reels, the only flanges are on the tape decks, called pancakes.
I designed a 3D printable copy of it because I was running out of metal ones, and this was the quickest option.

Print it with the big flat face down, with supports.