Reel for holding SMD components, as needed for pick-and-place machines. The standard version diameter is 7 inches, but this (and all other parameters) can be changed in the customizer. There are several widths, the most common for 8mm wide strips. Again, use the customizer for more options.
Print twice, then snap together, noting the alignment of the 3 slots in the hub. If you get it wrong, it does usually not really matter. Should be an easy print, no support nor brims needed.
There are two variants, one plain, and one with space for gluing a label. They can be combines at will.
This thing can be quite useful if you have a pick-and-place machine.It will even hold 8mm film, but then you need to make sure you get the 3 slots right :)