Spool insert for DURAMIC 3D PETG Filament with cardboard / fiber spools. I like that these are easier to recycle, but I don't like the dust the paper can create. This insert easily snaps into the spool and helps cut down on dust.
Insert outside diameter is 2.12" (53.75mm) length not including flange is 2.58" (65.5mm).
No support needed.
Here it is in action - https://youtube.com/shorts/eHhUFCcon60
The author marked this model as their own original creation.