Spool Holder End Cap (for slim spool holders)

This is an adjustable end cap for very slim spool holders. I have some spools of filament that have a very small center hole and needed a new holder entirely, this solved many of those problems for me but it will not fit on all spool holders, keep that in mind. the internal dimensions of the ring are 18.5mm and 19mm. Go ahead and try it out!