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This is a special part i design for use with my Mask of Intangibility. You slip it over the front of my Kanohi Ekore until it clicks into place, giving it a nice crown. I made this part because, despite the fact that we never saw a character with a "crown" in the toyline, it kinda makes sense lorewise.
Needless to say, this crown isn't compatible with any mask other than my Kanohi Ekore (https://www.shapeways.com/product/FD8Q4QJJF/kanohi-ekore-mask-of-intangibility-toa-tuyet?optionId=186848307&li=shops). Im also probably not going to MAKE a compatible version for any other mask as that would just be a royal difficulty. It seem that, due to the relative complexity of this part, Shapeways is charging quite a lot for it. If you don't want to buy if, you can download the model from my Thingiverse page.