Pointed Crown

The crown has a diameter of approximately 15 cm.

 It is quite small even for a 6-year-old child. 

If you want it to fit well, you need to enlarge it in the slicer to the required diameter. 

If you want the crown to fit perfectly, print it as is and cut it on the back. You can attach a rubber band there. It then stays on the head perfectly

Have fun