Spacer for Filament Spool Adaptor

This spacer (the white component) was designed as an accessory for my filament spool adaptor (the black component):
https://www.thingiverse.com/thing:2340642

This allows it to be used with spools which have a deeply recessed central hole (like the Flashforge filament reels I just bought).

The spacer has an internal diameter of 52mm, external diameter of 64mm and height of 10mm.