Nothing special I guess. Just another thing to make makers' life easier. It's just a mount thingy that turns filament spool 90 degrees and hopefully prevents oscillation of the spool while printing and improves overall quality of a print.
To assemble this thing you'll need: four M5x16 round head cup screws, two M5 nuts and two M5 washers (optional).
The author marked this model as their own original creation.