A hanger for https://makerworld.com/en/models/74985#profileId-84579
This hanger is tight fit to the top of the ball. Needs to be printed with PETG, Seems to very fragile, but in fact is very elastic.
The easiest method to insert the hook into the opening is to squeeze it on the end and push gently with screwdriver, it will bend enough to enter.
To be used with the model of the ball - the decor needs to be gently removed from the plate and cleaned from brim (to not loose the collar to fit the hanger) - some not ideal cleaning left-overs will secure better the fit.