This tiara was originally designed to crown my daughter who loves Elsa from Frozen, but a color swap can easily shift it to an evil sorceress tiara, a princess crown or just the setting for the Purple Gem of Doom. It will print scaled down to 30% but I suggest 60% or larger for wearable durability. The file posted is sized for a queen. 60% scale is great for my 3 year old.
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The author hasn't provided the model origin yet.