Originally made for spools of electrical wire that came packed very much like poorly spooled masterspool refills of filament. Design went untested because I didn't have a printer big enough to print proper size spools.
The center prongs have an optional tapering angle that is supposed so push the center of the spooled material outwards ensuring a friction fit with the inside of the spool. Make sure the center fit is snug and use long screws to pull the two halves together.
The author marked this model as their own original creation.