I have created a new model of the spool holder that's perfectly sized to the new and original sized sunlu spools. If you haven't printed any spool holders yet I would suggest those instead of this adapter system.
This is an adapter for the "Adjustable Spool Holder for Silica Gel / Spool Weight" that fits Sunlu spools.
The Sunlu filament spools have an internal size of roughly 72mm. These adapters will fit snugly in the spool without to much friction and prevent the dessicant holder itself from rattling around.
The author remixed this model.
This is an adapter for the "Adjustable Spool Holder for Silica Gel / Spool Weight" that fits Sunlu spools.